diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index f31d6768..d3ae1fbd 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -1,4 +1,4 @@
-# CI for lumen (Gitea Actions, GitHub-Actions-compatible syntax).
+# CI for punktfunk (Gitea Actions, GitHub-Actions-compatible syntax).
 # Adjust `runs-on` to match your runner labels if not using the default ubuntu image.
 name: ci
 
@@ -34,10 +34,10 @@ jobs:
         run: cargo test --workspace --locked
 
       - name: C ABI harness (standalone link proof)
-        run: bash crates/lumen-core/tests/c/run.sh
+        run: bash crates/punktfunk-core/tests/c/run.sh
 
       - name: Verify generated header is committed & up to date
         run: |
-          cargo build -p lumen-core
-          git diff --exit-code include/lumen_core.h \
-            || (echo "include/lumen_core.h is stale — commit the regenerated header" && exit 1)
+          cargo build -p punktfunk-core
+          git diff --exit-code include/punktfunk_core.h \
+            || (echo "include/punktfunk_core.h is stale — commit the regenerated header" && exit 1)
diff --git a/.gitignore b/.gitignore
index 5a465edf..904f3aec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,5 +9,5 @@ node_modules/
 dist/
 # Swift package build artifacts + the locally-built xcframework (rebuild via scripts/build-xcframework.sh)
 clients/apple/.build/
-clients/apple/LumenCore.xcframework/
+clients/apple/PunktfunkCore.xcframework/
 clients/apple/.swiftpm/
diff --git a/CLAUDE.md b/CLAUDE.md
index aae50fd5..1c1fa67d 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -1,17 +1,17 @@
-# CLAUDE.md — lumen
+# CLAUDE.md — punktfunk
 
 Low-latency desktop/game streaming stack, Linux-first, with a shared Rust protocol core
-(`lumen-core`) exposed over a C ABI and native clients per platform. Full design:
+(`punktfunk-core`) exposed over a C ABI and native clients per platform. Full design:
 [`docs/implementation-plan.md`](docs/implementation-plan.md). Status table: `README.md`.
 
 ## Where the work stands
 
-- **M1 (`lumen-core` + C ABI): complete and hardened.** FEC recovery, loopback-under-loss,
+- **M1 (`punktfunk-core` + C ABI): complete and hardened.** FEC recovery, loopback-under-loss,
   proptests, C ABI harness all green; 13 adversarial-review findings fixed +
   regression-tested (`a913042`).
 - **M2 (GameStream host): working end-to-end with a stock Moonlight client.** Validated live
   on this box: pairing (persists across restarts), serverinfo/applist (app catalog from
-  `~/.config/lumen/apps.json` → each entry picks a compositor + nested command), RTSP, ENet
+  `~/.config/punktfunk/apps.json` → each entry picks a compositor + nested command), RTSP, ENet
   control, audio, and video at the **client's native resolution and refresh** — the host
   creates a per-session virtual output via per-compositor `VirtualDisplay` backends:
   **KWin** (`zkde_screencast stream_virtual_output`, needs KWin ≥ 6.5.6 headless; >60 Hz via
@@ -26,27 +26,27 @@ Low-latency desktop/game streaming stack, Linux-first, with a shared Rust protoc
   socket, wlr protocols on Sway) and **gamepads** (uinput X-Box-360 pads + rumble
   back-channel; validated live — pad created/destroyed with the session). Management REST API +
   checked-in OpenAPI doc (`mgmt.rs`).
-- **M3 (`lumen/1`, the native protocol): full session planes, validated live.** QUIC
-  control plane (`lumen-core` `quic` feature: Hello{mode}/Welcome{full Config}/Start), data
+- **M3 (`punktfunk/1`, the native protocol): full session planes, validated live.** QUIC
+  control plane (`punktfunk-core` `quic` feature: Hello{mode}/Welcome{full Config}/Start), data
   plane = the hardened M1 `Session` over raw UDP with **GF(2¹⁶) Leopard FEC + AES-GCM**
   (inexpressible in GameStream), host creates the native virtual output at the client's
   requested mode. `m3-host` is a **persistent listener** (sessions back to back;
   `--max-sessions`). QUIC datagrams carry the side planes, demuxed by first byte: input
   0xC8 (incl. **gamepads** — incremental events accumulated into the uinput xpad), **Opus
   audio** 0xC9 (48 kHz stereo, 5 ms, host→client), **rumble** 0xCA (host→client). **Trust:**
-  host serves its persistent identity (`~/.config/lumen/cert.pem`, shared with GameStream
+  host serves its persistent identity (`~/.config/punktfunk/cert.pem`, shared with GameStream
   pairing) and logs the SHA-256 fingerprint; clients pin it (TOFU on first connect —
   `endpoint::client_pinned`). Measured on-box at 720p120: 1680/1680 frames, **p50 0.83 ms**
-  capture→…→reassembled; audio measured live (~200 pkts/s). `lumen-client-rs` is the
+  capture→…→reassembled; audio measured live (~200 pkts/s). `punktfunk-client-rs` is the
   working reference client (`--pin`, datagram counters, `--input-test` incl. gamepad).
-  The embeddable connector (`NativeClient`) exposes it all over the C ABI: `lumen_connect`
+  The embeddable connector (`NativeClient`) exposes it all over the C ABI: `punktfunk_connect`
   (pin/TOFU) + `next_au`/`next_audio`/`next_rumble`/`send_input`.
 
 ## What's left
 
 1. **M4 — client decode + present: macOS stage 1 done, first light achieved
-   (2026-06-10).** LumenKit compiles and is tested on macOS (AnnexB → VideoToolbox →
-   `AVSampleBufferDisplayLayer`, GCMouse/GCKeyboard capture, `LumenClient` app shell);
+   (2026-06-10).** PunktfunkKit compiles and is tested on macOS (AnnexB → VideoToolbox →
+   `AVSampleBufferDisplayLayer`, GCMouse/GCKeyboard capture, `PunktfunkClient` app shell);
    validated live Mac ↔ this box at 720p60 — vkcube on glass, input injected via gamescope
    EIS. Tests: `swift test` in `clients/apple` (unit + real-codec round trip),
    `test-loopback.sh` (Swift client vs synthetic m3-host on loopback — runs on macOS),
@@ -54,16 +54,16 @@ Low-latency desktop/game streaming stack, Linux-first, with a shared Rust protoc
    [`clients/apple/README.md`](clients/apple/README.md). Next: stage 2 presenter
    (`VTDecompressionSession` + `CAMetalLayer` frame pacing), glass-to-glass numbers via
    `tools/latency-probe` (scaffold), iOS variant. The Linux reference client
-   (`lumen-client-rs`) gets VAAPI + wgpu on the same connector later.
+   (`punktfunk-client-rs`) gets VAAPI + wgpu on the same connector later.
 2. **Sub-frame pipelining**: overlap encode and transmit within a frame. Requires a direct
    NVENC SDK wrapper (libavcodec only emits whole AUs) — the next big latency lever (~2–4 ms
    at high res).
-3. **lumen/1 protocol growth**: a PIN-style pairing ceremony on top of fingerprint pinning,
+3. **punktfunk/1 protocol growth**: a PIN-style pairing ceremony on top of fingerprint pinning,
    mid-stream mode renegotiation (the Welcome is one-shot today), concurrent sessions
    (today: one at a time, extras wait in the accept queue).
 4. **M2 polish**: wlroots/Sway `VirtualDisplay` backend (deferred; swaymsg `create_output`),
    HDR/10-bit/AV1 negotiation, surround audio, reconnect-at-new-mode robustness.
-5. **Native clients** (`clients/{apple,android}` scaffolds) consuming `lumen_core.h`.
+5. **Native clients** (`clients/{apple,android}` scaffolds) consuming `punktfunk_core.h`.
 
 Box one-time setup is complete: udev rule + `input` group (gamepads validated live),
 gamescope 3.16.22 installed system-wide (no PATH override), gnome-shell installed (Mutter
@@ -78,32 +78,32 @@ cargo clippy --workspace --all-targets -- -D warnings
 cargo fmt --all --check
 
 cargo run -p loss-harness        # FEC loss-resilience sweep (no network needed)
-bash crates/lumen-core/tests/c/run.sh   # standalone C-ABI link + round-trip proof
+bash crates/punktfunk-core/tests/c/run.sh   # standalone C-ABI link + round-trip proof
 ```
 
-Generated artifacts are **checked in** and CI fails on drift: `include/lumen_core.h`
-(cbindgen from `lumen-core/src/abi.rs`) and `docs/api/openapi.json` (regenerate with
-`cargo run -p lumen-host -- openapi > docs/api/openapi.json`; spec lives in `mgmt.rs`).
+Generated artifacts are **checked in** and CI fails on drift: `include/punktfunk_core.h`
+(cbindgen from `punktfunk-core/src/abi.rs`) and `docs/api/openapi.json` (regenerate with
+`cargo run -p punktfunk-host -- openapi > docs/api/openapi.json`; spec lives in `mgmt.rs`).
 
 ## Layout
 
 ```
-crates/lumen-core/        protocol · FEC · crypto · quic (lumen/1 control plane, feature-gated)
-crates/lumen-host/
+crates/punktfunk-core/        protocol · FEC · crypto · quic (punktfunk/1 control plane, feature-gated)
+crates/punktfunk-host/
   gamestream/             Moonlight compat: nvhttp · pairing · rtsp · control · stream · gamepad · apps
   vdisplay/{kwin,gamescope,mutter}.rs   per-compositor client-sized virtual outputs
   zerocopy/{egl,cuda,vulkan}.rs         dmabuf → CUDA → NVENC (tiled via EGL/GL, LINEAR via Vulkan)
   inject/{libei,wlr,gamepad}.rs         input backends (+ uinput virtual gamepads)
   capture.rs · encode.rs · audio.rs · m0.rs · m3.rs · mgmt.rs
-crates/lumen-client-rs/   lumen/1 reference client (M3 headless; M4 adds decode+present)
+crates/punktfunk-client-rs/   punktfunk/1 reference client (M3 headless; M4 adds decode+present)
 tools/{loss-harness,latency-probe}/     measurement (plan §10)
-scripts/                  60-lumen.rules · lumen-host.service · host.env.example · headless/
-include/lumen_core.h      generated C header
+scripts/                  60-punktfunk.rules · punktfunk-host.service · host.env.example · headless/
+include/punktfunk_core.h      generated C header
 ```
 
 ## Design invariants — do not regress
 
-- **One core, linked everywhere.** Protocol/FEC/crypto live only in `lumen-core`, behind a
+- **One core, linked everywhere.** Protocol/FEC/crypto live only in `punktfunk-core`, behind a
   stable, versioned C ABI. `tokio`/`quinn` exist only behind the `quic` feature (control
   plane); **no async on the per-frame path** — native threads only.
 - **Native client resolution, no scaling.** A session gets a virtual output at exactly the
@@ -111,7 +111,7 @@ include/lumen_core.h      generated C header
   remote_fd, preferred_mode, keepalive }`, RAII teardown). There is no cross-compositor
   protocol for this — each compositor keeps its own backend.
 - **FEC is the wall-breaker.** GF(2⁸) (≤255 shards/block, Moonlight-compatible) and GF(2¹⁶)
-  Leopard (≤65535 shards/block) — lumen/1 negotiates the latter, removing the ~1 Gbps
+  Leopard (≤65535 shards/block) — punktfunk/1 negotiates the latter, removing the ~1 Gbps
   ceiling.
 - **M1 security hardening stays intact**: reassembler bounds attacker-controlled fields
   before allocating (`ReassemblerLimits`); AES-GCM per-direction nonce salts + seq-as-AAD;
@@ -127,27 +127,26 @@ module — a kernel update silently drops it; reinstall `nvidia-driver-595-open`
 scanout → KWin `--drm` impossible; everything renders offscreen via `renderD128`.
 
 ```sh
-# compositor session (shell 1, or the systemd unit in scripts/):
-XDG_RUNTIME_DIR=/run/user/1000 DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus \
-XDG_CURRENT_DESKTOP=KDE KWIN_WAYLAND_NO_PERMISSION_CHECKS=1 \
-kwin_wayland --virtual --width 1920 --height 1080 --no-lockscreen --socket wayland-kde \
-  --exit-with-session wev
+# compositor session (shell 1, or the systemd unit in scripts/): full headless Plasma.
+# The script sets XDG_MENU_PREFIX=plasma- & co. — without it plasmashell runs but the
+# launcher menu is EMPTY (no apps, no System Settings).
+bash scripts/headless/run-headless-kde.sh 1920x1080
 
 # host (shell 2):
-WAYLAND_DISPLAY=wayland-kde XDG_CURRENT_DESKTOP=KDE LUMEN_VIDEO_SOURCE=virtual \
-LUMEN_ZEROCOPY=1 cargo run -rp lumen-host -- serve
+WAYLAND_DISPLAY=wayland-kde XDG_CURRENT_DESKTOP=KDE PUNKTFUNK_VIDEO_SOURCE=virtual \
+PUNKTFUNK_ZEROCOPY=1 cargo run -rp punktfunk-host -- serve
 
-# lumen/1 native loopback test (no Moonlight needed; same env as serve, listener persists
+# punktfunk/1 native loopback test (no Moonlight needed; same env as serve, listener persists
 # across sessions — bound it with --max-sessions):
-cargo run -rp lumen-host -- m3-host --source virtual --seconds 10 --max-sessions 1
-cargo run -rp lumen-client-rs -- --mode 1280x720x120 --out /tmp/a.h265 --input-test  # + --pin HEX
+cargo run -rp punktfunk-host -- m3-host --source virtual --seconds 10 --max-sessions 1
+cargo run -rp punktfunk-client-rs -- --mode 1280x720x120 --out /tmp/a.h265 --input-test  # + --pin HEX
 ```
 
 Pinned crate facts: `ashpd` 0.13 + `pipewire` 0.9 (must match ashpd's) + `ffmpeg-next` 8.x
-(system FFmpeg 8 / libavcodec 62). Env knobs: `LUMEN_VIDEO_SOURCE=virtual|portal`,
-`LUMEN_COMPOSITOR=kwin|gamescope|mutter`, `LUMEN_ZEROCOPY=1`, `LUMEN_GAMESCOPE_APP=...`,
-`LUMEN_INPUT_BACKEND=...`, `LUMEN_PERF=1` (per-stage timing), `LUMEN_VIDEO_DROP=N` (FEC
-test), `LUMEN_FEC_PCT=N`.
+(system FFmpeg 8 / libavcodec 62). Env knobs: `PUNKTFUNK_VIDEO_SOURCE=virtual|portal`,
+`PUNKTFUNK_COMPOSITOR=kwin|gamescope|mutter`, `PUNKTFUNK_ZEROCOPY=1`, `PUNKTFUNK_GAMESCOPE_APP=...`,
+`PUNKTFUNK_INPUT_BACKEND=...`, `PUNKTFUNK_PERF=1` (per-stage timing), `PUNKTFUNK_VIDEO_DROP=N` (FEC
+test), `PUNKTFUNK_FEC_PCT=N`.
 
 ## Conventions
 
@@ -155,4 +154,4 @@ test), `LUMEN_FEC_PCT=N`.
 - Match the surrounding code's comment density and naming.
 - Commit messages end with the Co-Authored-By trailer (see `git log`).
 - `pkill` caution on this box: match exact comm names (`pkill -x gamescope-wl`,
-  `pkill -x lumen-host`) — `pkill -f` self-matches the invoking shell.
+  `pkill -x punktfunk-host`) — `pkill -f` self-matches the invoking shell.
diff --git a/Cargo.lock b/Cargo.lock
index fde1b66d..ca874b09 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1451,7 +1451,7 @@ checksum = "953f07c43838f8e6f9758cab68bf5bed85465e7587ebe0b823f1bcd81978ad3a"
 name = "loss-harness"
 version = "0.0.1"
 dependencies = [
- "lumen-core",
+ "punktfunk-core",
 ]
 
 [[package]]
@@ -1460,90 +1460,6 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "112b39cec0b298b6c1999fee3e31427f74f676e4cb9879ed1a121b43661a4154"
 
-[[package]]
-name = "lumen-client-rs"
-version = "0.0.1"
-dependencies = [
- "anyhow",
- "lumen-core",
- "quinn",
- "tokio",
- "tracing",
- "tracing-subscriber",
-]
-
-[[package]]
-name = "lumen-core"
-version = "0.0.1"
-dependencies = [
- "aes-gcm",
- "bytes",
- "cbindgen",
- "fec-rs",
- "proptest",
- "quinn",
- "rand 0.9.4",
- "rcgen",
- "reed-solomon-simd",
- "rustls",
- "rustls-pki-types",
- "sha2",
- "thiserror 2.0.18",
- "tokio",
- "tracing",
- "zerocopy",
- "zeroize",
-]
-
-[[package]]
-name = "lumen-host"
-version = "0.0.1"
-dependencies = [
- "aes",
- "aes-gcm",
- "anyhow",
- "ash",
- "ashpd",
- "axum",
- "axum-server",
- "cbc",
- "ffmpeg-next",
- "futures-util",
- "hex",
- "http-body-util",
- "khronos-egl",
- "libc",
- "lumen-core",
- "mdns-sd",
- "opus",
- "pipewire",
- "quinn",
- "rand 0.8.6",
- "rcgen",
- "reis",
- "rsa",
- "rustls",
- "rustls-pemfile",
- "rusty_enet",
- "serde",
- "serde_json",
- "sha2",
- "tokio",
- "tower",
- "tracing",
- "tracing-subscriber",
- "utoipa",
- "utoipa-axum",
- "utoipa-scalar",
- "wayland-backend",
- "wayland-client",
- "wayland-protocols-misc",
- "wayland-protocols-wlr",
- "wayland-scanner",
- "x509-parser",
- "xkbcommon",
-]
-
 [[package]]
 name = "matchers"
 version = "0.2.0"
@@ -1981,6 +1897,90 @@ dependencies = [
  "unarray",
 ]
 
+[[package]]
+name = "punktfunk-client-rs"
+version = "0.0.1"
+dependencies = [
+ "anyhow",
+ "punktfunk-core",
+ "quinn",
+ "tokio",
+ "tracing",
+ "tracing-subscriber",
+]
+
+[[package]]
+name = "punktfunk-core"
+version = "0.0.1"
+dependencies = [
+ "aes-gcm",
+ "bytes",
+ "cbindgen",
+ "fec-rs",
+ "proptest",
+ "quinn",
+ "rand 0.9.4",
+ "rcgen",
+ "reed-solomon-simd",
+ "rustls",
+ "rustls-pki-types",
+ "sha2",
+ "thiserror 2.0.18",
+ "tokio",
+ "tracing",
+ "zerocopy",
+ "zeroize",
+]
+
+[[package]]
+name = "punktfunk-host"
+version = "0.0.1"
+dependencies = [
+ "aes",
+ "aes-gcm",
+ "anyhow",
+ "ash",
+ "ashpd",
+ "axum",
+ "axum-server",
+ "cbc",
+ "ffmpeg-next",
+ "futures-util",
+ "hex",
+ "http-body-util",
+ "khronos-egl",
+ "libc",
+ "mdns-sd",
+ "opus",
+ "pipewire",
+ "punktfunk-core",
+ "quinn",
+ "rand 0.8.6",
+ "rcgen",
+ "reis",
+ "rsa",
+ "rustls",
+ "rustls-pemfile",
+ "rusty_enet",
+ "serde",
+ "serde_json",
+ "sha2",
+ "tokio",
+ "tower",
+ "tracing",
+ "tracing-subscriber",
+ "utoipa",
+ "utoipa-axum",
+ "utoipa-scalar",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-protocols-misc",
+ "wayland-protocols-wlr",
+ "wayland-scanner",
+ "x509-parser",
+ "xkbcommon",
+]
+
 [[package]]
 name = "quick-error"
 version = "1.2.3"
diff --git a/Cargo.toml b/Cargo.toml
index fc3682d2..fbb8d1d2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,9 +1,9 @@
 [workspace]
 resolver = "2"
 members = [
-    "crates/lumen-core",
-    "crates/lumen-host",
-    "crates/lumen-client-rs",
+    "crates/punktfunk-core",
+    "crates/punktfunk-host",
+    "crates/punktfunk-client-rs",
     "tools/latency-probe",
     "tools/loss-harness",
 ]
@@ -14,15 +14,15 @@ edition = "2021"
 rust-version = "1.82"
 license = "MIT OR Apache-2.0"
 authors = ["unom"]
-repository = "https://git.unom.io/unom/lumen"
+repository = "https://git.unom.io/unom/punktfunk"
 
 [profile.release]
 opt-level = 3
 lto = "thin"
 codegen-units = 1
-# NOTE: deliberately NOT `panic = "abort"`. lumen-core ships as a cdylib/staticlib into
+# NOTE: deliberately NOT `panic = "abort"`. punktfunk-core ships as a cdylib/staticlib into
 # third-party apps (Swift/Kotlin/C) and its C ABI catches panics at the boundary
-# (`catch_unwind` → `LumenStatus::Panic`). `panic = "abort"` would make that guard a
+# (`catch_unwind` → `PunktfunkStatus::Panic`). `panic = "abort"` would make that guard a
 # no-op and let a stray panic abort the embedding application. Unwinding keeps the
 # documented isolation guarantee real.
 
diff --git a/README.md b/README.md
index df39fc36..770cdc63 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,9 @@
-# lumen
+# punktfunk
 
 *A ground-up low-latency desktop streaming stack, built Linux-first, with a shared Rust
 protocol core and native clients per platform.*
 
-`lumen` is a placeholder codename. The bet: ship a **Linux virtual-display streaming
+`punktfunk` is a placeholder codename. The bet: ship a **Linux virtual-display streaming
 host** that speaks the existing Moonlight protocol (every Moonlight/Artemis client works
 day one), then break the ~1 Gbps FEC wall with a **GF(2¹⁶) Leopard-RS** transport as a
 negotiated extension. See [`docs/implementation-plan.md`](docs/implementation-plan.md).
@@ -12,18 +12,18 @@ negotiated extension. See [`docs/implementation-plan.md`](docs/implementation-pl
 
 | Milestone | State |
 |-----------|-------|
-| **M1 — `lumen-core` + C ABI** | ✅ done & tested (FEC, packetization, crypto, session, `lumen_core.h`) |
-| **M0 — pipeline spike** (wlroots→PipeWire→NVENC→file→`lumen-core`) | ✅ done & verified on NVIDIA (RTX 5070 Ti / driver 595) |
+| **M1 — `punktfunk-core` + C ABI** | ✅ done & tested (FEC, packetization, crypto, session, `punktfunk_core.h`) |
+| **M0 — pipeline spike** (wlroots→PipeWire→NVENC→file→`punktfunk-core`) | ✅ done & verified on NVIDIA (RTX 5070 Ti / driver 595) |
 | M2 — P1 host → stock Moonlight | 🟡 capture+encode landed in M0; pairing/RTSP/vdisplay pending |
 | M3 — measurement harness | 🟡 `tools/loss-harness` runs; `latency-probe` scaffolded |
-| M4 — P2 transport + Rust client | 🟡 GF(2¹⁶) core done; `lumen-client-rs` scaffolded |
-| M5 — Apple client | 🟡 macOS first light: HEVC on glass + input over `lumen/1` (`clients/apple`) |
+| M4 — P2 transport + Rust client | 🟡 GF(2¹⁶) core done; `punktfunk-client-rs` scaffolded |
+| M5 — Apple client | 🟡 macOS first light: HEVC on glass + input over `punktfunk/1` (`clients/apple`) |
 
-`lumen-core` is complete and verified: it builds and its full test suite (FEC recovery,
+`punktfunk-core` is complete and verified: it builds and its full test suite (FEC recovery,
 loopback round-trip under loss, property tests, and a **C ABI harness**) passes on
-macOS/aarch64. **M0 is done:** `lumen-host` captures a headless wlroots output via the
+macOS/aarch64. **M0 is done:** `punktfunk-host` captures a headless wlroots output via the
 ScreenCast portal + PipeWire, encodes it with NVENC, writes a playable H.265 file, and
-round-trips every access unit through a `lumen_core` host→client session (see
+round-trips every access unit through a `punktfunk_core` host→client session (see
 `docs/linux-setup.md`). M2 is in flight: the GameStream control plane (`gamestream/`) and
 the management REST API (`mgmt.rs`, OpenAPI spec in `docs/api/`) are implemented; the
 remaining Linux host backends (KWin/Mutter virtual displays, libei input) are
@@ -33,11 +33,11 @@ remaining Linux host backends (KWin/Mutter virtual displays, libei input) are
 
 ```
 crates/
-  lumen-core/        protocol · FEC · pacing · crypto — the C ABI (lib + cdylib + staticlib)
-  lumen-host/        Linux host: vdisplay · capture · encode · inject · gamestream · mgmt
-  lumen-client-rs/   reference client (M4): VAAPI decode + wgpu present
-clients/{apple,android}/   native client scaffolds (import lumen_core.h)
-include/lumen_core.h       cbindgen-generated C header (checked in)
+  punktfunk-core/        protocol · FEC · pacing · crypto — the C ABI (lib + cdylib + staticlib)
+  punktfunk-host/        Linux host: vdisplay · capture · encode · inject · gamestream · mgmt
+  punktfunk-client-rs/   reference client (M4): VAAPI decode + wgpu present
+clients/{apple,android}/   native client scaffolds (import punktfunk_core.h)
+include/punktfunk_core.h       cbindgen-generated C header (checked in)
 tools/{latency-probe,loss-harness}/   measurement (plan §10)
 docs/implementation-plan.md
 ```
@@ -50,16 +50,16 @@ cargo test  --workspace          # unit + loopback + proptest + C ABI harness
 cargo clippy --workspace --all-targets
 
 cargo run -p loss-harness        # FEC loss-resilience sweep (no network needed)
-bash crates/lumen-core/tests/c/run.sh   # standalone C-ABI link+round-trip proof
+bash crates/punktfunk-core/tests/c/run.sh   # standalone C-ABI link+round-trip proof
 ```
 
-The C header regenerates from `crates/lumen-core/src/abi.rs` on every build (cbindgen via
-`build.rs`) into `include/lumen_core.h`.
+The C header regenerates from `crates/punktfunk-core/src/abi.rs` on every build (cbindgen via
+`build.rs`) into `include/punktfunk_core.h`.
 
 ## Design invariants
 
-- **One core, linked everywhere.** Protocol/FEC/crypto/pacing live in `lumen-core` exactly
-  once, exposed over a stable, versioned C ABI (`lumen_abi_version()`, `LumenConfig`
+- **One core, linked everywhere.** Protocol/FEC/crypto/pacing live in `punktfunk-core` exactly
+  once, exposed over a stable, versioned C ABI (`punktfunk_abi_version()`, `PunktfunkConfig`
   carries its own `struct_size`).
 - **No async on the hot path.** The per-frame pipeline uses native threads only;
   `tokio`/`quinn` are gated behind the off-by-default `quic` feature (control plane only).
diff --git a/clients/android/README.md b/clients/android/README.md
index 49dc4083..ec6a31bd 100644
--- a/clients/android/README.md
+++ b/clients/android/README.md
@@ -1,18 +1,18 @@
-# lumen Android client (later)
+# punktfunk Android client (later)
 
-Kotlin UI + MediaCodec (decode) + a thin JNI layer over the `lumen-core` C ABI.
+Kotlin UI + MediaCodec (decode) + a thin JNI layer over the `punktfunk-core` C ABI.
 
 ## Wiring
 
 1. Build the core as a shared library per Android ABI:
    ```sh
    rustup target add aarch64-linux-android armv7-linux-androideabi x86_64-linux-android
-   cargo build -p lumen-core --release --target aarch64-linux-android   # liblumen_core.so
+   cargo build -p punktfunk-core --release --target aarch64-linux-android   # libpunktfunk_core.so
    ```
    (Use `cargo-ndk` to handle the NDK toolchain/linker.)
-2. JNI shim: small C/Rust glue mapping `lumen_*` to Kotlin `external fun`s, bundling
-   `liblumen_core.so` into the APK's `jniLibs/`.
-3. Kotlin: client `LumenSession` → `lumen_client_poll_frame` on a decode thread → feed
+2. JNI shim: small C/Rust glue mapping `punktfunk_*` to Kotlin `external fun`s, bundling
+   `libpunktfunk_core.so` into the APK's `jniLibs/`.
+3. Kotlin: client `PunktfunkSession` → `punktfunk_client_poll_frame` on a decode thread → feed
    `MediaCodec` → render to a `SurfaceView` aligned to the display refresh.
 
 ## Status
diff --git a/clients/apple/Package.swift b/clients/apple/Package.swift
index 3fa0316d..52125baa 100644
--- a/clients/apple/Package.swift
+++ b/clients/apple/Package.swift
@@ -1,21 +1,21 @@
 // swift-tools-version: 5.9
-// LumenKit — Swift wrapper around the lumen-core C ABI (lumen/1 client connector) plus the
-// SwiftUI/VideoToolbox presentation layer. Build LumenCore.xcframework first:
+// PunktfunkKit — Swift wrapper around the punktfunk-core C ABI (punktfunk/1 client connector) plus the
+// SwiftUI/VideoToolbox presentation layer. Build PunktfunkCore.xcframework first:
 //   bash ../../scripts/build-xcframework.sh   (on a Mac; see README.md)
 import PackageDescription
 
 let package = Package(
-    name: "LumenKit",
+    name: "PunktfunkKit",
     platforms: [.macOS(.v14), .iOS(.v17)],
     products: [
-        .library(name: "LumenKit", targets: ["LumenKit"]),
-        .executable(name: "LumenClient", targets: ["LumenClient"]),
+        .library(name: "PunktfunkKit", targets: ["PunktfunkKit"]),
+        .executable(name: "PunktfunkClient", targets: ["PunktfunkClient"]),
     ],
     targets: [
-        .binaryTarget(name: "LumenCore", path: "LumenCore.xcframework"),
+        .binaryTarget(name: "PunktfunkCore", path: "PunktfunkCore.xcframework"),
         .target(
-            name: "LumenKit",
-            dependencies: ["LumenCore"],
+            name: "PunktfunkKit",
+            dependencies: ["PunktfunkCore"],
             linkerSettings: [
                 // Rust staticlib system deps.
                 .linkedFramework("Security"),
@@ -23,8 +23,8 @@ let package = Package(
                 .linkedLibrary("resolv"),
             ]
         ),
-        // Development app shell (swift run LumenClient): connect form → stream + input.
-        .executableTarget(name: "LumenClient", dependencies: ["LumenKit"]),
-        .testTarget(name: "LumenKitTests", dependencies: ["LumenKit"]),
+        // Development app shell (swift run PunktfunkClient): connect form → stream + input.
+        .executableTarget(name: "PunktfunkClient", dependencies: ["PunktfunkKit"]),
+        .testTarget(name: "PunktfunkKitTests", dependencies: ["PunktfunkKit"]),
     ]
 )
diff --git a/clients/apple/README.md b/clients/apple/README.md
index 3325d788..09c89604 100644
--- a/clients/apple/README.md
+++ b/clients/apple/README.md
@@ -1,31 +1,31 @@
-# lumen Apple client (SwiftUI)
+# punktfunk Apple client (SwiftUI)
 
-The native macOS/iOS client for **`lumen/1`** (the post-GameStream protocol). All
+The native macOS/iOS client for **`punktfunk/1`** (the post-GameStream protocol). All
 networking/protocol work — QUIC control plane, UDP data plane, GF(2¹⁶) FEC, AES-GCM,
 input datagrams, Opus audio, cert pinning — lives in the shared Rust core (statically
-linked as `LumenCore.xcframework`); this package is the Swift shell: decode
+linked as `PunktfunkCore.xcframework`); this package is the Swift shell: decode
 (VideoToolbox), present (SwiftUI), input capture.
 
 ## Status — first light achieved (2026-06-10)
 
 Validated live, Mac ↔ Linux box over the LAN: gamescope virtual output → NVENC HEVC →
-`lumen/1` (GF(2¹⁶) FEC + AES-GCM over UDP, QUIC control) → VideoToolbox →
+`punktfunk/1` (GF(2¹⁶) FEC + AES-GCM over UDP, QUIC control) → VideoToolbox →
 `AVSampleBufferDisplayLayer` on glass at 1280×720@60, with mouse/keyboard flowing back as
 QUIC datagrams into the host's gamescope EIS injector (thousands of events injected during
 the session). Headless variant of the same proof: `RemoteFirstLightTests` decoded 60/60
 received AUs spanning 983 ms of host capture clock.
 
-The connector underneath (`lumen_core::client::NativeClient` over the C ABI) carries the
+The connector underneath (`punktfunk_core::client::NativeClient` over the C ABI) carries the
 full session: video AUs, **Opus audio** (`nextAudio()`), **rumble** (`nextRumble()`),
 input incl. gamepads, and **cert pinning + TOFU** (`pinSHA256:`/`hostFingerprint`) — see
 `m3.rs::tests::c_abi_connection_roundtrip` (three sequential sessions: TOFU, pinned
-reconnect, wrong-pin rejection). The host (`lumen-host m3-host`) is a persistent listener:
+reconnect, wrong-pin rejection). The host (`punktfunk-host m3-host`) is a persistent listener:
 reconnect at will during development.
 
 What's here, all compiled and tested on macOS (Xcode 26.5 / Swift 6.3):
 
-- **`LumenKit`** (library)
-  - `LumenConnection.swift` — wrapper over the C ABI. AUs/audio are copied into `Data`
+- **`PunktfunkKit`** (library)
+  - `PunktfunkConnection.swift` — wrapper over the C ABI. AUs/audio are copied into `Data`
     (the C pointer is only valid until the next call of the same kind). `close()` is safe
     from any thread: per-plane locks enforce the C contract ("never close with a
     `next_au`/`next_audio` in flight") instead of leaving it to callers. Pinning + TOFU
@@ -39,7 +39,7 @@ What's here, all compiled and tested on macOS (Xcode 26.5 / Swift 6.3):
     `vk_to_evdev` consumes Windows VKs), with fractional-delta accumulation so sub-pixel
     motion isn't truncated away. Buttons use GameStream ids (1=left … 5=X2); scroll is
     WHEEL_DELTA(120)-scaled.
-- **`LumenClient`** (development app shell): connect form → stream + input, fps/Mb-s HUD.
+- **`PunktfunkClient`** (development app shell): connect form → stream + input, fps/Mb-s HUD.
   (Audio playback and gamepad capture are not wired into the app yet — the connector
   surface is there; see notes 5–6.)
 - **Tests** (`swift test`): byte-level Annex-B units; a real-codec round trip
@@ -51,29 +51,29 @@ What's here, all compiled and tested on macOS (Xcode 26.5 / Swift 6.3):
 
 ```sh
 rustup target add aarch64-apple-darwin x86_64-apple-darwin
-bash scripts/build-xcframework.sh        # → clients/apple/LumenCore.xcframework
+bash scripts/build-xcframework.sh        # → clients/apple/PunktfunkCore.xcframework
 cd clients/apple
 swift build && swift test                # loopback/remote tests self-skip without a host
-swift run LumenClient                    # the app; or open Package.swift in Xcode
+swift run PunktfunkClient                    # the app; or open Package.swift in Xcode
 
-bash test-loopback.sh                    # full loopback proof: builds lumen-host
+bash test-loopback.sh                    # full loopback proof: builds punktfunk-host
                                          # (synthetic source — runs on macOS), streams
                                          # byte-verified frames into the Swift client
 
 # against the real host (Linux box, see CLAUDE.md "Running on this box") — m3-host is a
 # persistent listener, reconnect at will:
-#   LUMEN_COMPOSITOR=gamescope LUMEN_GAMESCOPE_APP=vkcube LUMEN_ZEROCOPY=1 \
-#   cargo run -rp lumen-host -- m3-host --source virtual --seconds 60
-LUMEN_REMOTE_HOST=<box-ip> swift test --filter RemoteFirstLightTests   # headless
-LUMEN_AUTOCONNECT=<box-ip> LUMEN_MODE=1280x720x60 swift run LumenClient # on glass
+#   PUNKTFUNK_COMPOSITOR=gamescope PUNKTFUNK_GAMESCOPE_APP=vkcube PUNKTFUNK_ZEROCOPY=1 \
+#   cargo run -rp punktfunk-host -- m3-host --source virtual --seconds 60
+PUNKTFUNK_REMOTE_HOST=<box-ip> swift test --filter RemoteFirstLightTests   # headless
+PUNKTFUNK_AUTOCONNECT=<box-ip> PUNKTFUNK_MODE=1280x720x60 swift run PunktfunkClient # on glass
 ```
 
 ## Notes for whoever picks this up next
 
 1. **cbindgen import quirk** (the predicted "small compile fixes", now fixed): the
-   C17-compatible header spells `LumenStatus`/`LumenInputKind` as integer typedefs while
+   C17-compatible header spells `PunktfunkStatus`/`PunktfunkInputKind` as integer typedefs while
    the enum *constants* import into Swift as a distinct same-named type — bridge with
-   `.rawValue` (see the top of `LumenConnection.swift`). Don't fight the generated header.
+   `.rawValue` (see the top of `PunktfunkConnection.swift`). Don't fight the generated header.
 2. **ABI contract**: one video pump thread per connection, plus optionally one *separate*
    audio drain thread for `nextAudio()`/`nextRumble()` (the core keeps per-plane borrow
    slots, so the planes never alias); `send()` is enqueue-only and safe alongside all of
@@ -91,7 +91,7 @@ LUMEN_AUTOCONNECT=<box-ip> LUMEN_MODE=1280x720x60 swift run LumenClient # on gla
    `AVAudioEngine` source node; conceal gaps (drop/dup) rather than blocking — the Rust
    side buffers 320 ms and drops the newest packet when the puller lags. Wall-clock
    `ptsNs` shares the host clock with video AUs for A/V sync. Wiring this into
-   `LumenClient` is the next app-side task.
+   `PunktfunkClient` is the next app-side task.
 6. **Gamepads**: `GCController` → `.gamepadButton(...)`/`.gamepadAxis(...)` events (wire
    contract documented on the constructors; the host accumulates them into a virtual
    Xbox 360 pad). Poll `nextRumble()` and feed `GCDeviceHaptics` for force feedback.
@@ -99,7 +99,7 @@ LUMEN_AUTOCONNECT=<box-ip> LUMEN_MODE=1280x720x60 swift run LumenClient # on gla
 7. **Trust**: connect once with `pinSHA256: nil` (TOFU), persist `hostFingerprint` keyed
    by host, pass it on every later connect — a mismatch throws `.connectFailed`. The host
    logs its fingerprint at startup ("clients pin this fingerprint") for out-of-band
-   verification UX; a PIN-style pairing ceremony is a later lumen-core task. `LumenClient`
+   verification UX; a PIN-style pairing ceremony is a later punktfunk-core task. `PunktfunkClient`
    doesn't persist fingerprints yet — add it alongside the "add host" UX.
 8. **Input capture caveats** (stage 1): GC handlers only fire while the app has focus —
    on focus loss `InputCapture` auto-releases everything still held (keys + buttons) so
diff --git a/clients/apple/Sources/LumenClient/ContentView.swift b/clients/apple/Sources/PunktfunkClient/ContentView.swift
similarity index 83%
rename from clients/apple/Sources/LumenClient/ContentView.swift
rename to clients/apple/Sources/PunktfunkClient/ContentView.swift
index 58e2670f..ae448b57 100644
--- a/clients/apple/Sources/LumenClient/ContentView.swift
+++ b/clients/apple/Sources/PunktfunkClient/ContentView.swift
@@ -1,16 +1,16 @@
 // Connect form ⇄ live stream. Stage-1 UX: pick host + mode, see frames, type/aim.
 
 import AppKit
-import LumenKit
+import PunktfunkKit
 import SwiftUI
 
 struct ContentView: View {
     @StateObject private var model = SessionModel()
-    @AppStorage("lumen.host") private var host = "192.168.1.70"
-    @AppStorage("lumen.port") private var port = 9777
-    @AppStorage("lumen.width") private var width = 1920
-    @AppStorage("lumen.height") private var height = 1080
-    @AppStorage("lumen.hz") private var hz = 60
+    @AppStorage("punktfunk.host") private var host = "192.168.1.70"
+    @AppStorage("punktfunk.port") private var port = 9777
+    @AppStorage("punktfunk.width") private var width = 1920
+    @AppStorage("punktfunk.height") private var height = 1080
+    @AppStorage("punktfunk.hz") private var hz = 60
 
     var body: some View {
         Group {
@@ -24,17 +24,17 @@ struct ContentView: View {
         .onDisappear { model.disconnect() } // window closed mid-session (Cmd+N spawns more)
     }
 
-    /// Development hook: LUMEN_AUTOCONNECT=host[:port] connects immediately at the saved
-    /// (or LUMEN_MODE=WxHxHz) mode — lets scripts drive first-light runs. (IPv4/hostname
+    /// Development hook: PUNKTFUNK_AUTOCONNECT=host[:port] connects immediately at the saved
+    /// (or PUNKTFUNK_MODE=WxHxHz) mode — lets scripts drive first-light runs. (IPv4/hostname
     /// only; an IPv6 literal would need bracket parsing.)
     private func autoConnectIfAsked() {
-        guard let target = ProcessInfo.processInfo.environment["LUMEN_AUTOCONNECT"],
+        guard let target = ProcessInfo.processInfo.environment["PUNKTFUNK_AUTOCONNECT"],
               !target.isEmpty, model.connection == nil, !model.connecting
         else { return }
         let parts = target.split(separator: ":")
         host = String(parts[0])
         if parts.count == 2, let p = Int(parts[1]) { port = p }
-        if let mode = ProcessInfo.processInfo.environment["LUMEN_MODE"] {
+        if let mode = ProcessInfo.processInfo.environment["PUNKTFUNK_MODE"] {
             let dims = mode.split(separator: "x").compactMap { Int($0) }
             if dims.count == 3 {
                 width = dims[0]
@@ -48,7 +48,7 @@ struct ContentView: View {
             hz: UInt32(clamping: hz))
     }
 
-    private func stream(_ conn: LumenConnection) -> some View {
+    private func stream(_ conn: PunktfunkConnection) -> some View {
         StreamView(
             connection: conn,
             onFrame: { [meter = model.meter] au in meter.note(byteCount: au.data.count) },
@@ -61,7 +61,7 @@ struct ContentView: View {
         .background(Color.black)
     }
 
-    private func hud(_ conn: LumenConnection) -> some View {
+    private func hud(_ conn: PunktfunkConnection) -> some View {
         VStack(alignment: .trailing, spacing: 4) {
             Text("\(conn.width)×\(conn.height)@\(conn.refreshHz)  \(model.fps) fps  \(model.mbps, specifier: "%.1f") Mb/s")
                 .font(.system(.caption, design: .monospaced))
@@ -76,7 +76,7 @@ struct ContentView: View {
 
     private var connectForm: some View {
         VStack(spacing: 14) {
-            Text("lumen").font(.largeTitle.weight(.semibold))
+            Text("punktfunk").font(.largeTitle.weight(.semibold))
             Form {
                 TextField("Host", text: $host)
                 TextField("Port", value: $port, format: .number.grouping(.never))
diff --git a/clients/apple/Sources/LumenClient/LumenClientApp.swift b/clients/apple/Sources/PunktfunkClient/PunktfunkClientApp.swift
similarity index 82%
rename from clients/apple/Sources/LumenClient/LumenClientApp.swift
rename to clients/apple/Sources/PunktfunkClient/PunktfunkClientApp.swift
index 42f24810..308c8abc 100644
--- a/clients/apple/Sources/LumenClient/LumenClientApp.swift
+++ b/clients/apple/Sources/PunktfunkClient/PunktfunkClientApp.swift
@@ -1,15 +1,15 @@
-// LumenClient — development app shell around LumenKit (swift run LumenClient).
+// PunktfunkClient — development app shell around PunktfunkKit (swift run PunktfunkClient).
 // Connect form → StreamView (AVSampleBufferDisplayLayer HEVC) + InputCapture.
 
 import AppKit
 import SwiftUI
 
 @main
-struct LumenClientApp: App {
+struct PunktfunkClientApp: App {
     @NSApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate
 
     var body: some Scene {
-        WindowGroup("lumen") {
+        WindowGroup("punktfunk") {
             ContentView()
         }
     }
diff --git a/clients/apple/Sources/LumenClient/SessionModel.swift b/clients/apple/Sources/PunktfunkClient/SessionModel.swift
similarity index 90%
rename from clients/apple/Sources/LumenClient/SessionModel.swift
rename to clients/apple/Sources/PunktfunkClient/SessionModel.swift
index 598fe62a..aa9942f6 100644
--- a/clients/apple/Sources/LumenClient/SessionModel.swift
+++ b/clients/apple/Sources/PunktfunkClient/SessionModel.swift
@@ -2,7 +2,7 @@
 // pump-thread → main-actor stats relay.
 
 import Foundation
-import LumenKit
+import PunktfunkKit
 import SwiftUI
 
 /// Pump-thread-side frame counters; a 1 Hz main-actor timer drains them into @Published
@@ -35,7 +35,7 @@ final class FrameMeter: @unchecked Sendable {
 
 @MainActor
 final class SessionModel: ObservableObject {
-    @Published var connection: LumenConnection?
+    @Published var connection: PunktfunkConnection?
     @Published var connecting = false
     @Published var errorMessage: String?
     @Published var fps = 0
@@ -51,8 +51,8 @@ final class SessionModel: ObservableObject {
         connecting = true
         errorMessage = nil
         Task.detached(priority: .userInitiated) {
-            // LumenConnection.init blocks on the QUIC handshake — keep it off the main actor.
-            let result = Result { try LumenConnection(
+            // PunktfunkConnection.init blocks on the QUIC handshake — keep it off the main actor.
+            let result = Result { try PunktfunkConnection(
                 host: host, port: port, width: width, height: height, refreshHz: hz) }
             await MainActor.run { [weak self] in
                 guard let self else { return }
@@ -64,7 +64,7 @@ final class SessionModel: ObservableObject {
                     self.startStatsTimer()
                 case .failure:
                     self.errorMessage = "Connection failed — is the host running? " +
-                        "(lumen-host m3-host on \(host):\(port))"
+                        "(punktfunk-host m3-host on \(host):\(port))"
                 }
             }
         }
@@ -92,7 +92,7 @@ final class SessionModel: ObservableObject {
         errorMessage = "Session ended by host."
     }
 
-    private func startInput(_ conn: LumenConnection) {
+    private func startInput(_ conn: PunktfunkConnection) {
         let capture = InputCapture(connection: conn)
         capture.start()
         inputCapture = capture
diff --git a/clients/apple/Sources/LumenKit/AnnexB.swift b/clients/apple/Sources/PunktfunkKit/AnnexB.swift
similarity index 98%
rename from clients/apple/Sources/LumenKit/AnnexB.swift
rename to clients/apple/Sources/PunktfunkKit/AnnexB.swift
index 00a5414a..ed9436de 100644
--- a/clients/apple/Sources/LumenKit/AnnexB.swift
+++ b/clients/apple/Sources/PunktfunkKit/AnnexB.swift
@@ -1,6 +1,6 @@
 // Annex-B HEVC → CoreMedia plumbing.
 //
-// The lumen host emits Annex-B access units with in-band VPS/SPS/PPS on every IDR
+// The punktfunk host emits Annex-B access units with in-band VPS/SPS/PPS on every IDR
 // (deliberately — the client needs no out-of-band extradata). VideoToolbox wants the AVCC
 // flavor instead: a CMVideoFormatDescription built from the parameter sets, and sample
 // buffers whose NALs are 4-byte-length-prefixed. This file converts between the two.
diff --git a/clients/apple/Sources/LumenKit/InputCapture.swift b/clients/apple/Sources/PunktfunkKit/InputCapture.swift
similarity index 97%
rename from clients/apple/Sources/LumenKit/InputCapture.swift
rename to clients/apple/Sources/PunktfunkKit/InputCapture.swift
index 5685e0ab..54deb90f 100644
--- a/clients/apple/Sources/LumenKit/InputCapture.swift
+++ b/clients/apple/Sources/PunktfunkKit/InputCapture.swift
@@ -1,4 +1,4 @@
-// Input capture → lumen/1 datagrams, via the GameController framework.
+// Input capture → punktfunk/1 datagrams, via the GameController framework.
 //
 // GCMouse delivers RAW deltas (not the accelerated cursor) — exactly what the host-side
 // injector expects for relative motion. GCKeyboard gives HID keycodes which we map to the
@@ -22,12 +22,12 @@
 import AppKit
 import Foundation
 import GameController
-import LumenCore
+import PunktfunkCore
 
 public final class InputCapture {
     private static weak var activeCapture: InputCapture?
 
-    private let connection: LumenConnection
+    private let connection: PunktfunkConnection
     private var observers: [NSObjectProtocol] = []
     private var mice: [GCMouse] = []
     private var keyboards: [GCKeyboard] = []
@@ -40,7 +40,7 @@ public final class InputCapture {
     private var pressedVKs: Set<UInt32> = []
     private var pressedButtons: Set<UInt32> = []
 
-    public init(connection: LumenConnection) {
+    public init(connection: PunktfunkConnection) {
         self.connection = connection
     }
 
@@ -183,7 +183,7 @@ public final class InputCapture {
     }
 
     /// HID usage (GCKeyCode raw) → Windows VK (the host maps VK → evdev; every VK emitted
-    /// here exists in lumen-host/src/inject.rs::vk_to_evdev — extend the two together).
+    /// here exists in punktfunk-host/src/inject.rs::vk_to_evdev — extend the two together).
     static let hidToVK: [Int: UInt32] = {
         var m: [Int: UInt32] = [:]
         // a–z: HID 0x04..0x1D → VK 'A'..'Z'.
diff --git a/clients/apple/Sources/LumenKit/LumenConnection.swift b/clients/apple/Sources/PunktfunkKit/PunktfunkConnection.swift
similarity index 74%
rename from clients/apple/Sources/LumenKit/LumenConnection.swift
rename to clients/apple/Sources/PunktfunkKit/PunktfunkConnection.swift
index 7dc6086e..820130cd 100644
--- a/clients/apple/Sources/LumenKit/LumenConnection.swift
+++ b/clients/apple/Sources/PunktfunkKit/PunktfunkConnection.swift
@@ -1,6 +1,6 @@
-// Swift wrapper around the lumen-core C ABI's lumen/1 connection API.
+// Swift wrapper around the punktfunk-core C ABI's punktfunk/1 connection API.
 //
-// Threading contract (mirrors the C header): one LumenConnection is pumped from a single
+// Threading contract (mirrors the C header): one PunktfunkConnection is pumped from a single
 // video thread via nextAU(); nextAudio()/nextRumble() may each run on their own (single)
 // drain thread — the core keeps per-plane borrow slots, so the planes never alias;
 // send() is enqueue-only and safe alongside all of them. The pointers inside an AU/audio
@@ -18,14 +18,14 @@
 // close, the pull methods throw `.closed` and the threads unwind on their own.
 
 import Foundation
-import LumenCore
+import PunktfunkCore
 
 // cbindgen's C17-compatible header spells the typedefs as plain integers
-// (`typedef int32_t LumenStatus`, `typedef uint8_t LumenInputKind`) while the enum
+// (`typedef int32_t PunktfunkStatus`, `typedef uint8_t PunktfunkInputKind`) while the enum
 // constants import as a distinct same-named Swift type — bridge by raw value once here.
-private let statusOK: Int32 = LUMEN_STATUS_OK.rawValue
-private let statusNoFrame: Int32 = LUMEN_STATUS_NO_FRAME.rawValue
-private let statusClosed: Int32 = LUMEN_STATUS_CLOSED.rawValue
+private let statusOK: Int32 = PUNKTFUNK_STATUS_OK.rawValue
+private let statusNoFrame: Int32 = PUNKTFUNK_STATUS_NO_FRAME.rawValue
+private let statusClosed: Int32 = PUNKTFUNK_STATUS_CLOSED.rawValue
 
 /// One reassembled, FEC-recovered, decrypted access unit (Annex-B HEVC from the host).
 public struct AccessUnit: Sendable {
@@ -43,7 +43,7 @@ public struct AudioPacket: Sendable {
     public let seq: UInt32
 }
 
-public enum LumenClientError: Error {
+public enum PunktfunkClientError: Error {
     /// Connect failed — wrong host/port, timeout, or a certificate-pin mismatch.
     case connectFailed
     /// `pinSHA256` was non-nil but not exactly 32 bytes. Failing closed: connecting
@@ -53,7 +53,7 @@ public enum LumenClientError: Error {
     case status(Int32)
 }
 
-public final class LumenConnection {
+public final class PunktfunkConnection {
     private var handle: OpaquePointer?
     /// Set by close() before it contends for the plane locks: the pullers see it at their
     /// next poll boundary and exit, so close() can't be starved by back-to-back polls
@@ -88,22 +88,22 @@ public final class LumenConnection {
         pinSHA256: Data? = nil,
         timeoutMs: UInt32 = 10_000
     ) throws {
-        if let pin = pinSHA256, pin.count != 32 { throw LumenClientError.invalidPin }
+        if let pin = pinSHA256, pin.count != 32 { throw PunktfunkClientError.invalidPin }
         var observed = [UInt8](repeating: 0, count: 32)
         handle = host.withCString { cs in
             if let pin = pinSHA256 {
                 return pin.withUnsafeBytes { p in
-                    lumen_connect(
+                    punktfunk_connect(
                         cs, port, width, height, refreshHz,
                         p.bindMemory(to: UInt8.self).baseAddress, &observed, timeoutMs)
                 }
             }
-            return lumen_connect(cs, port, width, height, refreshHz, nil, &observed, timeoutMs)
+            return punktfunk_connect(cs, port, width, height, refreshHz, nil, &observed, timeoutMs)
         }
-        guard handle != nil else { throw LumenClientError.connectFailed }
+        guard handle != nil else { throw PunktfunkClientError.connectFailed }
         hostFingerprint = Data(observed)
         var w: UInt32 = 0, h: UInt32 = 0, hz: UInt32 = 0
-        _ = lumen_connection_mode(handle, &w, &h, &hz)
+        _ = punktfunk_connection_mode(handle, &w, &h, &hz)
         self.width = w
         self.height = h
         self.refreshHz = hz
@@ -114,10 +114,10 @@ public final class LumenConnection {
     public func nextAU(timeoutMs: UInt32 = 100) throws -> AccessUnit? {
         pumpLock.lock()
         defer { pumpLock.unlock() }
-        guard let h = liveHandle() else { throw LumenClientError.closed }
+        guard let h = liveHandle() else { throw PunktfunkClientError.closed }
 
-        var frame = LumenFrame()
-        let rc = lumen_connection_next_au(h, &frame, timeoutMs)
+        var frame = PunktfunkFrame()
+        let rc = punktfunk_connection_next_au(h, &frame, timeoutMs)
         switch rc {
         case statusOK:
             guard let base = frame.data, frame.len > 0 else { return nil }
@@ -128,9 +128,9 @@ public final class LumenConnection {
         case statusNoFrame:
             return nil
         case statusClosed:
-            throw LumenClientError.closed
+            throw PunktfunkClientError.closed
         default:
-            throw LumenClientError.status(rc)
+            throw PunktfunkClientError.status(rc)
         }
     }
 
@@ -140,10 +140,10 @@ public final class LumenConnection {
     public func nextAudio(timeoutMs: UInt32 = 100) throws -> AudioPacket? {
         audioLock.lock()
         defer { audioLock.unlock() }
-        guard let h = liveHandle() else { throw LumenClientError.closed }
+        guard let h = liveHandle() else { throw PunktfunkClientError.closed }
 
-        var pkt = LumenAudioPacket()
-        let rc = lumen_connection_next_audio(h, &pkt, timeoutMs)
+        var pkt = PunktfunkAudioPacket()
+        let rc = punktfunk_connection_next_audio(h, &pkt, timeoutMs)
         switch rc {
         case statusOK:
             guard let base = pkt.data, pkt.len > 0 else { return nil }
@@ -152,9 +152,9 @@ public final class LumenConnection {
         case statusNoFrame:
             return nil
         case statusClosed:
-            throw LumenClientError.closed
+            throw PunktfunkClientError.closed
         default:
-            throw LumenClientError.status(rc)
+            throw PunktfunkClientError.status(rc)
         }
     }
 
@@ -164,30 +164,30 @@ public final class LumenConnection {
     public func nextRumble(timeoutMs: UInt32 = 0) throws -> (pad: UInt16, low: UInt16, high: UInt16)? {
         audioLock.lock()
         defer { audioLock.unlock() }
-        guard let h = liveHandle() else { throw LumenClientError.closed }
+        guard let h = liveHandle() else { throw PunktfunkClientError.closed }
 
         var pad: UInt16 = 0, low: UInt16 = 0, high: UInt16 = 0
-        let rc = lumen_connection_next_rumble(h, &pad, &low, &high, timeoutMs)
+        let rc = punktfunk_connection_next_rumble(h, &pad, &low, &high, timeoutMs)
         switch rc {
         case statusOK:
             return (pad, low, high)
         case statusNoFrame:
             return nil
         case statusClosed:
-            throw LumenClientError.closed
+            throw PunktfunkClientError.closed
         default:
-            throw LumenClientError.status(rc)
+            throw PunktfunkClientError.status(rc)
         }
     }
 
     /// Send one input event (delivered to the host as a QUIC datagram). Thread-safe;
     /// silently dropped after close.
-    public func send(_ event: LumenInputEvent) {
+    public func send(_ event: PunktfunkInputEvent) {
         var ev = event
         abiLock.lock()
         defer { abiLock.unlock() }
         guard let h = handle, !closeRequested else { return }
-        _ = lumen_connection_send_input(h, &ev)
+        _ = punktfunk_connection_send_input(h, &ev)
     }
 
     /// Close the connection and free the handle. Safe from any thread, idempotent; waits
@@ -205,7 +205,7 @@ public final class LumenConnection {
         audioLock.unlock()
         pumpLock.unlock()
         if let h {
-            lumen_connection_close(h) // joins the connection's internal Rust threads
+            punktfunk_connection_close(h) // joins the connection's internal Rust threads
         }
     }
 
@@ -220,46 +220,46 @@ public final class LumenConnection {
 }
 
 // Convenience constructors for the wire input events (field semantics match
-// lumen_core::input::InputEvent; see lumen_core.h).
-public extension LumenInputEvent {
+// punktfunk_core::input::InputEvent; see punktfunk_core.h).
+public extension PunktfunkInputEvent {
     private static func make(
         _ kind: UInt32, code: UInt32, x: Int32, y: Int32, flags: UInt32 = 0
-    ) -> LumenInputEvent {
-        LumenInputEvent(kind: UInt8(kind), _pad: (0, 0, 0), code: code, x: x, y: y, flags: flags)
+    ) -> PunktfunkInputEvent {
+        PunktfunkInputEvent(kind: UInt8(kind), _pad: (0, 0, 0), code: code, x: x, y: y, flags: flags)
     }
-    static func mouseMove(dx: Int32, dy: Int32) -> LumenInputEvent {
-        make(LUMEN_INPUT_KIND_MOUSE_MOVE.rawValue, code: 0, x: dx, y: dy)
+    static func mouseMove(dx: Int32, dy: Int32) -> PunktfunkInputEvent {
+        make(PUNKTFUNK_INPUT_KIND_MOUSE_MOVE.rawValue, code: 0, x: dx, y: dy)
     }
     /// GameStream button ids: 1=left 2=middle 3=right 4=X1 5=X2 (host maps to evdev BTN_*).
-    static func mouseButton(_ button: UInt32, down: Bool) -> LumenInputEvent {
+    static func mouseButton(_ button: UInt32, down: Bool) -> PunktfunkInputEvent {
         make(
-            (down ? LUMEN_INPUT_KIND_MOUSE_BUTTON_DOWN : LUMEN_INPUT_KIND_MOUSE_BUTTON_UP).rawValue,
+            (down ? PUNKTFUNK_INPUT_KIND_MOUSE_BUTTON_DOWN : PUNKTFUNK_INPUT_KIND_MOUSE_BUTTON_UP).rawValue,
             code: button, x: 0, y: 0)
     }
     /// `vk` is a Windows virtual-key code (the host's vk_to_evdev table consumes these).
-    static func key(_ vk: UInt32, down: Bool) -> LumenInputEvent {
-        make((down ? LUMEN_INPUT_KIND_KEY_DOWN : LUMEN_INPUT_KIND_KEY_UP).rawValue, code: vk, x: 0, y: 0)
+    static func key(_ vk: UInt32, down: Bool) -> PunktfunkInputEvent {
+        make((down ? PUNKTFUNK_INPUT_KIND_KEY_DOWN : PUNKTFUNK_INPUT_KIND_KEY_UP).rawValue, code: vk, x: 0, y: 0)
     }
     /// WHEEL_DELTA(120)-scaled; positive = up (vertical) / right (horizontal) — the
     /// convention Moonlight/SDL use; the host maps onto the ei/wl axes.
-    static func scroll(_ delta: Int32, horizontal: Bool = false) -> LumenInputEvent {
-        make(LUMEN_INPUT_KIND_MOUSE_SCROLL.rawValue, code: horizontal ? 1 : 0, x: delta, y: 0)
+    static func scroll(_ delta: Int32, horizontal: Bool = false) -> PunktfunkInputEvent {
+        make(PUNKTFUNK_INPUT_KIND_MOUSE_SCROLL.rawValue, code: horizontal ? 1 : 0, x: delta, y: 0)
     }
 
-    // Gamepad (wire contract in lumen_core::input::gamepad): one transition per event,
+    // Gamepad (wire contract in punktfunk_core::input::gamepad): one transition per event,
     // `pad` = controller index, accumulated host-side into a virtual Xbox 360 pad.
 
     /// `button` is a GameStream buttonFlags bit (A=0x1000 B=0x2000 X=0x4000 Y=0x8000,
     /// dpad=0x1/2/4/8, start=0x10 back=0x20 LS=0x40 RS=0x80 LB=0x100 RB=0x200 guide=0x400).
-    static func gamepadButton(_ button: UInt32, down: Bool, pad: UInt32 = 0) -> LumenInputEvent {
+    static func gamepadButton(_ button: UInt32, down: Bool, pad: UInt32 = 0) -> PunktfunkInputEvent {
         make(
-            LUMEN_INPUT_KIND_GAMEPAD_BUTTON.rawValue,
+            PUNKTFUNK_INPUT_KIND_GAMEPAD_BUTTON.rawValue,
             code: button, x: down ? 1 : 0, y: 0, flags: pad)
     }
 
     /// Axis ids: 0=LSX 1=LSY 2=RSX 3=RSY (−32768...32767, XInput convention: +y = UP —
     /// `GCControllerDirectionPad.yAxis` already matches, no flip), 4=LT 5=RT (0...255).
-    static func gamepadAxis(_ axis: UInt32, value: Int32, pad: UInt32 = 0) -> LumenInputEvent {
-        make(LUMEN_INPUT_KIND_GAMEPAD_AXIS.rawValue, code: axis, x: value, y: 0, flags: pad)
+    static func gamepadAxis(_ axis: UInt32, value: Int32, pad: UInt32 = 0) -> PunktfunkInputEvent {
+        make(PUNKTFUNK_INPUT_KIND_GAMEPAD_AXIS.rawValue, code: axis, x: value, y: 0, flags: pad)
     }
 }
diff --git a/clients/apple/Sources/LumenKit/StreamView.swift b/clients/apple/Sources/PunktfunkKit/StreamView.swift
similarity index 91%
rename from clients/apple/Sources/LumenKit/StreamView.swift
rename to clients/apple/Sources/PunktfunkKit/StreamView.swift
index 40bb87f1..c112e43b 100644
--- a/clients/apple/Sources/LumenKit/StreamView.swift
+++ b/clients/apple/Sources/PunktfunkKit/StreamView.swift
@@ -1,4 +1,4 @@
-// SwiftUI presentation: AVSampleBufferDisplayLayer fed straight from the lumen/1 connection.
+// SwiftUI presentation: AVSampleBufferDisplayLayer fed straight from the punktfunk/1 connection.
 //
 // Stage-1 presenter (see README): the layer accepts *compressed* HEVC sample buffers and
 // does hardware decode + display itself — fastest path to pixels, IOSurface-backed
@@ -13,13 +13,13 @@ import AVFoundation
 import SwiftUI
 
 public struct StreamView: NSViewRepresentable {
-    private let connection: LumenConnection
+    private let connection: PunktfunkConnection
     private let onFrame: (@Sendable (AccessUnit) -> Void)?
     private let onSessionEnd: (@Sendable () -> Void)?
 
     /// `onFrame`/`onSessionEnd` fire on the pump thread — hop to the main actor for UI.
     public init(
-        connection: LumenConnection,
+        connection: PunktfunkConnection,
         onFrame: (@Sendable (AccessUnit) -> Void)? = nil,
         onSessionEnd: (@Sendable () -> Void)? = nil
     ) {
@@ -67,7 +67,7 @@ public final class StreamLayerView: NSView {
 
     private let displayLayer = AVSampleBufferDisplayLayer()
     private var token: PumpToken?
-    public private(set) var connection: LumenConnection?
+    public private(set) var connection: PunktfunkConnection?
 
     public override init(frame: NSRect) {
         super.init(frame: frame)
@@ -81,7 +81,7 @@ public final class StreamLayerView: NSView {
     /// Pump thread: pull AUs from the connection, wrap, enqueue. The first IDR yields the
     /// format description; non-IDR AUs before it are dropped (the host opens with an IDR).
     public func start(
-        connection: LumenConnection,
+        connection: PunktfunkConnection,
         onFrame: (@Sendable (AccessUnit) -> Void)? = nil,
         onSessionEnd: (@Sendable () -> Void)? = nil
     ) {
@@ -104,7 +104,7 @@ public final class StreamLayerView: NSView {
                     if layer.status == .failed {
                         // Decode wedged: flush and re-gate on the next in-band parameter
                         // sets — resuming with a delta frame can't recover. (A
-                        // request-IDR channel on lumen/1 is a host-side TODO; with the
+                        // request-IDR channel on punktfunk/1 is a host-side TODO; with the
                         // host's infinite GOP this may otherwise stay black until the
                         // next recovery keyframe.)
                         layer.flush()
@@ -123,13 +123,13 @@ public final class StreamLayerView: NSView {
                 }
             }
         }
-        thread.name = "lumen-pump"
+        thread.name = "punktfunk-pump"
         thread.qualityOfService = .userInteractive
         thread.start()
     }
 
     /// Stop pumping (≤ one poll timeout). Does not close the connection — that stays with
-    /// whoever owns it (LumenConnection.close() is safe alongside a draining pump).
+    /// whoever owns it (PunktfunkConnection.close() is safe alongside a draining pump).
     public func stop() {
         token?.cancel()
         token = nil
diff --git a/clients/apple/Tests/LumenKitTests/AnnexBTests.swift b/clients/apple/Tests/PunktfunkKitTests/AnnexBTests.swift
similarity index 98%
rename from clients/apple/Tests/LumenKitTests/AnnexBTests.swift
rename to clients/apple/Tests/PunktfunkKitTests/AnnexBTests.swift
index e4a32edf..8bde7056 100644
--- a/clients/apple/Tests/LumenKitTests/AnnexBTests.swift
+++ b/clients/apple/Tests/PunktfunkKitTests/AnnexBTests.swift
@@ -2,7 +2,7 @@
 // VideoToolboxRoundTripTests covers the real-bitstream path).
 
 import XCTest
-@testable import LumenKit
+@testable import PunktfunkKit
 
 final class AnnexBTests: XCTestCase {
     /// NAL with the given HEVC type in bits 1..6 of the first header byte.
diff --git a/clients/apple/Tests/LumenKitTests/LoopbackIntegrationTests.swift b/clients/apple/Tests/PunktfunkKitTests/LoopbackIntegrationTests.swift
similarity index 82%
rename from clients/apple/Tests/LumenKitTests/LoopbackIntegrationTests.swift
rename to clients/apple/Tests/PunktfunkKitTests/LoopbackIntegrationTests.swift
index d7a0b137..21f4baa3 100644
--- a/clients/apple/Tests/LumenKitTests/LoopbackIntegrationTests.swift
+++ b/clients/apple/Tests/PunktfunkKitTests/LoopbackIntegrationTests.swift
@@ -1,20 +1,20 @@
-// Integration: the Swift wrapper against a real lumen/1 host over QUIC + UDP on loopback —
-// the Swift twin of lumen-host's m3.rs::c_abi_connection_roundtrip, this time through the
+// Integration: the Swift wrapper against a real punktfunk/1 host over QUIC + UDP on loopback —
+// the Swift twin of punktfunk-host's m3.rs::c_abi_connection_roundtrip, this time through the
 // statically linked xcframework. Driven by clients/apple/test-loopback.sh, which builds and
-// starts `lumen-host m3-host --source synthetic` and sets LUMEN_LOOPBACK_PORT.
+// starts `punktfunk-host m3-host --source synthetic` and sets PUNKTFUNK_LOOPBACK_PORT.
 
 import XCTest
-@testable import LumenKit
+@testable import PunktfunkKit
 
 final class LoopbackIntegrationTests: XCTestCase {
     func testSyntheticStreamRoundTrip() throws {
-        guard let portStr = ProcessInfo.processInfo.environment["LUMEN_LOOPBACK_PORT"],
+        guard let portStr = ProcessInfo.processInfo.environment["PUNKTFUNK_LOOPBACK_PORT"],
               let port = UInt16(portStr)
         else {
             throw XCTSkip("needs a running m3-host — use clients/apple/test-loopback.sh")
         }
 
-        let conn = try LumenConnection(
+        let conn = try PunktfunkConnection(
             host: "127.0.0.1", port: port, width: 1280, height: 720, refreshHz: 60)
         XCTAssertEqual(conn.width, 1280)
         XCTAssertEqual(conn.height, 720)
@@ -49,7 +49,7 @@ final class LoopbackIntegrationTests: XCTestCase {
 
         conn.close()
         XCTAssertThrowsError(try conn.nextAU(timeoutMs: 10)) { error in
-            guard case LumenClientError.closed = error else {
+            guard case PunktfunkClientError.closed = error else {
                 return XCTFail("expected .closed, got \(error)")
             }
         }
@@ -58,7 +58,7 @@ final class LoopbackIntegrationTests: XCTestCase {
     func testConnectFailureThrows() {
         // Nothing listens on this port; connect must fail within its timeout, not hang.
         XCTAssertThrowsError(
-            try LumenConnection(
+            try PunktfunkConnection(
                 host: "127.0.0.1", port: 9, width: 640, height: 480, refreshHz: 30,
                 timeoutMs: 2000))
     }
diff --git a/clients/apple/Tests/LumenKitTests/RemoteFirstLightTests.swift b/clients/apple/Tests/PunktfunkKitTests/RemoteFirstLightTests.swift
similarity index 85%
rename from clients/apple/Tests/LumenKitTests/RemoteFirstLightTests.swift
rename to clients/apple/Tests/PunktfunkKitTests/RemoteFirstLightTests.swift
index afd094ef..aba9b2b9 100644
--- a/clients/apple/Tests/LumenKitTests/RemoteFirstLightTests.swift
+++ b/clients/apple/Tests/PunktfunkKitTests/RemoteFirstLightTests.swift
@@ -4,25 +4,25 @@
 // putting the layer on glass.
 //
 // Run (host side, on the Linux box):
-//   LUMEN_COMPOSITOR=gamescope LUMEN_GAMESCOPE_APP=vkcube LUMEN_ZEROCOPY=1 \
-//   lumen-host m3-host --source virtual --seconds 120
+//   PUNKTFUNK_COMPOSITOR=gamescope PUNKTFUNK_GAMESCOPE_APP=vkcube PUNKTFUNK_ZEROCOPY=1 \
+//   punktfunk-host m3-host --source virtual --seconds 120
 // Then here:
-//   LUMEN_REMOTE_HOST=192.168.1.70 swift test --filter RemoteFirstLightTests
+//   PUNKTFUNK_REMOTE_HOST=192.168.1.70 swift test --filter RemoteFirstLightTests
 
 import CoreMedia
 import VideoToolbox
 import XCTest
-@testable import LumenKit
+@testable import PunktfunkKit
 
 final class RemoteFirstLightTests: XCTestCase {
     func testRemoteStreamDecodesToPixels() throws {
-        guard let host = ProcessInfo.processInfo.environment["LUMEN_REMOTE_HOST"] else {
-            throw XCTSkip("set LUMEN_REMOTE_HOST (and start m3-host --source virtual there)")
+        guard let host = ProcessInfo.processInfo.environment["PUNKTFUNK_REMOTE_HOST"] else {
+            throw XCTSkip("set PUNKTFUNK_REMOTE_HOST (and start m3-host --source virtual there)")
         }
         let width: UInt32 = 1280
         let height: UInt32 = 720
 
-        let conn = try LumenConnection(
+        let conn = try PunktfunkConnection(
             host: host, width: width, height: height, refreshHz: 60)
         defer { conn.close() }
         XCTAssertEqual(conn.width, width)
diff --git a/clients/apple/Tests/LumenKitTests/VideoToolboxRoundTripTests.swift b/clients/apple/Tests/PunktfunkKitTests/VideoToolboxRoundTripTests.swift
similarity index 98%
rename from clients/apple/Tests/LumenKitTests/VideoToolboxRoundTripTests.swift
rename to clients/apple/Tests/PunktfunkKitTests/VideoToolboxRoundTripTests.swift
index e9ab4299..03c3b46b 100644
--- a/clients/apple/Tests/LumenKitTests/VideoToolboxRoundTripTests.swift
+++ b/clients/apple/Tests/PunktfunkKitTests/VideoToolboxRoundTripTests.swift
@@ -1,13 +1,13 @@
 // Real-bitstream proof of the decode-prep path: VTCompressionSession encodes HEVC, we
 // rebuild the host's wire shape (Annex-B AU with in-band VPS/SPS/PPS — exactly what
-// lumen-host emits on every IDR), run it through AnnexB, and hand the result to a real
+// punktfunk-host emits on every IDR), run it through AnnexB, and hand the result to a real
 // VTDecompressionSession. Pixels out = the whole client decode path is sound.
 
 import AVFoundation
 import CoreMedia
 import VideoToolbox
 import XCTest
-@testable import LumenKit
+@testable import PunktfunkKit
 
 final class VideoToolboxRoundTripTests: XCTestCase {
     private let width = 320
diff --git a/clients/apple/test-loopback.sh b/clients/apple/test-loopback.sh
index 3c218962..16a0ec0a 100755
--- a/clients/apple/test-loopback.sh
+++ b/clients/apple/test-loopback.sh
@@ -1,17 +1,17 @@
 #!/usr/bin/env bash
-# Loopback integration: a real lumen/1 host (synthetic source — pure protocol, runs fine on
+# Loopback integration: a real punktfunk/1 host (synthetic source — pure protocol, runs fine on
 # macOS) on 127.0.0.1, then the Swift integration tests against it through the xcframework.
 # The m3 host serves exactly one session and exits; the trap is just for failure paths.
 set -euo pipefail
 cd "$(dirname "$0")/../.."
 
-PORT="${LUMEN_LOOPBACK_PORT:-19778}"
+PORT="${PUNKTFUNK_LOOPBACK_PORT:-19778}"
 
-cargo build --release -p lumen-host
-target/release/lumen-host m3-host --port "$PORT" --source synthetic --frames 300 &
+cargo build --release -p punktfunk-host
+target/release/punktfunk-host m3-host --port "$PORT" --source synthetic --frames 300 &
 HOST_PID=$!
 trap 'kill "$HOST_PID" 2>/dev/null || true' EXIT
 sleep 1
 
 cd clients/apple
-LUMEN_LOOPBACK_PORT="$PORT" swift test --filter LoopbackIntegrationTests
+PUNKTFUNK_LOOPBACK_PORT="$PORT" swift test --filter LoopbackIntegrationTests
diff --git a/crates/lumen-core/cbindgen.toml b/crates/lumen-core/cbindgen.toml
deleted file mode 100644
index ea528963..00000000
--- a/crates/lumen-core/cbindgen.toml
+++ /dev/null
@@ -1,56 +0,0 @@
-language = "C"
-pragma_once = true
-include_guard = "LUMEN_CORE_H"
-autogen_warning = "/* Generated by cbindgen from lumen-core. Do not edit by hand. */"
-header = "/* lumen-core C ABI — see crates/lumen-core/src/abi.rs */"
-style = "type"
-cpp_compat = true
-tab_width = 4
-documentation = true
-documentation_style = "c99"
-
-[parse]
-parse_deps = false
-
-[export.rename]
-"InputEvent" = "LumenInputEvent"
-"InputKind" = "LumenInputKind"
-# Gamepad wire constants: bare BTN_* names collide with <linux/input-event-codes.h> (at
-# DIFFERENT values — last definition silently wins); prefix everything we export.
-"BTN_DPAD_UP" = "LUMEN_BTN_DPAD_UP"
-"BTN_DPAD_DOWN" = "LUMEN_BTN_DPAD_DOWN"
-"BTN_DPAD_LEFT" = "LUMEN_BTN_DPAD_LEFT"
-"BTN_DPAD_RIGHT" = "LUMEN_BTN_DPAD_RIGHT"
-"BTN_START" = "LUMEN_BTN_START"
-"BTN_BACK" = "LUMEN_BTN_BACK"
-"BTN_LS_CLICK" = "LUMEN_BTN_LS_CLICK"
-"BTN_RS_CLICK" = "LUMEN_BTN_RS_CLICK"
-"BTN_LB" = "LUMEN_BTN_LB"
-"BTN_RB" = "LUMEN_BTN_RB"
-"BTN_GUIDE" = "LUMEN_BTN_GUIDE"
-"BTN_A" = "LUMEN_BTN_A"
-"BTN_B" = "LUMEN_BTN_B"
-"BTN_X" = "LUMEN_BTN_X"
-"BTN_Y" = "LUMEN_BTN_Y"
-"AXIS_LS_X" = "LUMEN_AXIS_LS_X"
-"AXIS_LS_Y" = "LUMEN_AXIS_LS_Y"
-"AXIS_RS_X" = "LUMEN_AXIS_RS_X"
-"AXIS_RS_Y" = "LUMEN_AXIS_RS_Y"
-"AXIS_LT" = "LUMEN_AXIS_LT"
-"AXIS_RT" = "LUMEN_AXIS_RT"
-"AUDIO_MAGIC" = "LUMEN_AUDIO_MAGIC"
-"RUMBLE_MAGIC" = "LUMEN_RUMBLE_MAGIC"
-
-# QualifiedScreamingSnakeCase already qualifies each variant with the enum name
-# (LumenStatus::Ok -> LUMEN_STATUS_OK); do NOT also set prefix_with_name or it doubles.
-[enum]
-rename_variants = "QualifiedScreamingSnakeCase"
-
-[fn]
-sort_by = "None"
-
-[struct]
-derive_eq = false
-
-[defines]
-"feature = quic" = "LUMEN_FEATURE_QUIC"
diff --git a/crates/lumen-client-rs/Cargo.toml b/crates/punktfunk-client-rs/Cargo.toml
similarity index 67%
rename from crates/lumen-client-rs/Cargo.toml
rename to crates/punktfunk-client-rs/Cargo.toml
index c782de15..a7f80534 100644
--- a/crates/lumen-client-rs/Cargo.toml
+++ b/crates/punktfunk-client-rs/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
-name = "lumen-client-rs"
-description = "lumen reference client (M4): VAAPI decode + wgpu/Vulkan present"
+name = "punktfunk-client-rs"
+description = "punktfunk reference client (M4): VAAPI decode + wgpu/Vulkan present"
 version.workspace = true
 edition.workspace = true
 rust-version.workspace = true
@@ -9,7 +9,7 @@ authors.workspace = true
 repository.workspace = true
 
 [dependencies]
-lumen-core = { path = "../lumen-core", features = ["quic"] }
+punktfunk-core = { path = "../punktfunk-core", features = ["quic"] }
 quinn = "0.11"
 tokio = { version = "1", features = ["rt-multi-thread", "net", "time", "macros"] }
 anyhow = "1"
diff --git a/crates/lumen-client-rs/src/main.rs b/crates/punktfunk-client-rs/src/main.rs
similarity index 91%
rename from crates/lumen-client-rs/src/main.rs
rename to crates/punktfunk-client-rs/src/main.rs
index 90ea18f2..856ad209 100644
--- a/crates/lumen-client-rs/src/main.rs
+++ b/crates/punktfunk-client-rs/src/main.rs
@@ -1,4 +1,4 @@
-//! `lumen-client-rs` — the reference client for `lumen/1` (M3): QUIC control plane, UDP data
+//! `punktfunk-client-rs` — the reference client for `punktfunk/1` (M3): QUIC control plane, UDP data
 //! plane, input over QUIC datagrams. Two modes, decided by the host's Welcome:
 //!
 //! * **verification** (`frames > 0`, synthetic host): byte-checks deterministic test frames;
@@ -14,15 +14,15 @@
 //! Host→client datagrams (Opus audio, rumble) are counted and reported with the stream
 //! stats — decode/playback is the platform clients' job.
 //!
-//! Usage: `lumen-client-rs [--connect HOST:PORT] [--mode WxHxFPS] [--out FILE] [--input-test]
+//! Usage: `punktfunk-client-rs [--connect HOST:PORT] [--mode WxHxFPS] [--out FILE] [--input-test]
 //!         [--pin HEX]` (M4 adds VAAPI decode + wgpu present on this same skeleton.)
 
 use anyhow::{anyhow, Context, Result};
-use lumen_core::config::Role;
-use lumen_core::input::{InputEvent, InputKind};
-use lumen_core::quic::{endpoint, io, Hello, Start, Welcome};
-use lumen_core::transport::UdpTransport;
-use lumen_core::{LumenError, Mode, Session};
+use punktfunk_core::config::Role;
+use punktfunk_core::input::{InputEvent, InputKind};
+use punktfunk_core::quic::{endpoint, io, Hello, Start, Welcome};
+use punktfunk_core::transport::UdpTransport;
+use punktfunk_core::{Mode, PunktfunkError, Session};
 use std::io::Write;
 
 struct Args {
@@ -126,25 +126,25 @@ async fn session(args: Args) -> Result<()> {
     let (ep, observed) = endpoint::client_pinned(args.pin);
     let ep = ep.map_err(|e| anyhow!("QUIC client endpoint: {e}"))?;
     let conn = ep
-        .connect(remote, "lumen")
+        .connect(remote, "punktfunk")
         .context("connect")?
         .await
         .context("QUIC handshake (a pin mismatch fails here)")?;
     match (args.pin, *observed.lock().unwrap()) {
-        (Some(_), _) => tracing::info!(%remote, "lumen/1 connected — host fingerprint pinned"),
+        (Some(_), _) => tracing::info!(%remote, "punktfunk/1 connected — host fingerprint pinned"),
         (None, Some(fp)) => tracing::info!(
             %remote,
             fingerprint = %hex(&fp),
-            "lumen/1 connected (trust-on-first-use) — pass --pin to verify this host"
+            "punktfunk/1 connected (trust-on-first-use) — pass --pin to verify this host"
         ),
-        (None, None) => tracing::info!(%remote, "lumen/1 connected"),
+        (None, None) => tracing::info!(%remote, "punktfunk/1 connected"),
     }
     let (mut send, mut recv) = conn.open_bi().await.context("open control stream")?;
 
     io::write_msg(
         &mut send,
         &Hello {
-            abi_version: lumen_core::ABI_VERSION,
+            abi_version: punktfunk_core::ABI_VERSION,
             mode: args.mode,
         }
         .encode(),
@@ -210,7 +210,7 @@ async fn session(args: Args) -> Result<()> {
                     }
                     // Gamepad plane: tap A + sweep the left stick on pad 0 (the host
                     // accumulates these into its virtual xpad; needs /dev/uinput access).
-                    use lumen_core::input::gamepad::{AXIS_LS_X, BTN_A};
+                    use punktfunk_core::input::gamepad::{AXIS_LS_X, BTN_A};
                     let pad_events = [
                         (InputKind::GamepadButton, BTN_A, 1),
                         (InputKind::GamepadButton, BTN_A, 0),
@@ -260,10 +260,10 @@ async fn session(args: Args) -> Result<()> {
         tokio::spawn(async move {
             use std::sync::atomic::Ordering::Relaxed;
             while let Ok(d) = conn2.read_datagram().await {
-                if let Some((_, _, opus)) = lumen_core::quic::decode_audio_datagram(&d) {
+                if let Some((_, _, opus)) = punktfunk_core::quic::decode_audio_datagram(&d) {
                     a.fetch_add(1, Relaxed);
                     ab.fetch_add(opus.len() as u64, Relaxed);
-                } else if lumen_core::quic::decode_rumble_datagram(&d).is_some() {
+                } else if punktfunk_core::quic::decode_rumble_datagram(&d).is_some() {
                     r.fetch_add(1, Relaxed);
                 }
             }
@@ -333,7 +333,7 @@ async fn session(args: Args) -> Result<()> {
                         }
                     }
                 }
-                Err(LumenError::NoFrame) => {
+                Err(PunktfunkError::NoFrame) => {
                     std::thread::sleep(std::time::Duration::from_micros(300));
                 }
                 Err(e) => return Err(anyhow!("poll_frame: {e:?}")),
@@ -359,7 +359,7 @@ async fn session(args: Args) -> Result<()> {
             lat_p95_us = pct(0.95),
             lat_p99_us = pct(0.99),
             lat_max_us = latencies_us.last().copied().unwrap_or(0),
-            "lumen/1 stream complete (capture→reassembled latency, same-host clock)"
+            "punktfunk/1 stream complete (capture→reassembled latency, same-host clock)"
         );
         if expected > 0 {
             anyhow::ensure!(mismatched == 0, "{mismatched} corrupted frames");
@@ -394,7 +394,7 @@ async fn session(args: Args) -> Result<()> {
     result
 }
 
-/// The host's deterministic test frame (mirror of `lumen-host::m3::test_frame`).
+/// The host's deterministic test frame (mirror of `punktfunk-host::m3::test_frame`).
 fn test_frame(idx: u32, len: usize) -> Vec<u8> {
     let mut d = vec![0u8; len];
     if len >= 4 {
diff --git a/crates/lumen-core/Cargo.toml b/crates/punktfunk-core/Cargo.toml
similarity index 81%
rename from crates/lumen-core/Cargo.toml
rename to crates/punktfunk-core/Cargo.toml
index dc2bb39d..023228bb 100644
--- a/crates/lumen-core/Cargo.toml
+++ b/crates/punktfunk-core/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
-name = "lumen-core"
-description = "lumen shared protocol/transport/FEC core, exposed over a stable C ABI"
+name = "punktfunk-core"
+description = "punktfunk shared protocol/transport/FEC core, exposed over a stable C ABI"
 version.workspace = true
 edition.workspace = true
 rust-version.workspace = true
@@ -9,10 +9,10 @@ authors.workspace = true
 repository.workspace = true
 
 [lib]
-name = "lumen_core"
-# `lib`       — so lumen-host / lumen-client-rs / tools link it as a normal Rust crate.
-# `staticlib` — `liblumen_core.a` for the C test harness and static embedding.
-# `cdylib`    — `liblumen_core.{so,dylib}` for Swift/Kotlin clients via the C ABI.
+name = "punktfunk_core"
+# `lib`       — so punktfunk-host / punktfunk-client-rs / tools link it as a normal Rust crate.
+# `staticlib` — `libpunktfunk_core.a` for the C test harness and static embedding.
+# `cdylib`    — `libpunktfunk_core.{so,dylib}` for Swift/Kotlin clients via the C ABI.
 crate-type = ["lib", "cdylib", "staticlib"]
 
 [features]
diff --git a/crates/lumen-core/build.rs b/crates/punktfunk-core/build.rs
similarity index 70%
rename from crates/lumen-core/build.rs
rename to crates/punktfunk-core/build.rs
index f0a8551f..134c8c8f 100644
--- a/crates/lumen-core/build.rs
+++ b/crates/punktfunk-core/build.rs
@@ -1,4 +1,4 @@
-//! Generate the C header (`include/lumen_core.h`) from the `extern "C"` surface.
+//! Generate the C header (`include/punktfunk_core.h`) from the `extern "C"` surface.
 //!
 //! cbindgen failure is a warning, not a hard error, so the crate still builds in minimal
 //! environments (e.g. a CI image without the full toolchain); the header is checked in.
@@ -15,20 +15,20 @@ fn main() {
     println!("cargo:rerun-if-changed=cbindgen.toml");
 
     let crate_dir = env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR");
-    // Workspace-level include/ dir: crates/lumen-core/ -> ../../include/
+    // Workspace-level include/ dir: crates/punktfunk-core/ -> ../../include/
     let out = PathBuf::from(&crate_dir)
         .join("..")
         .join("..")
         .join("include")
-        .join("lumen_core.h");
+        .join("punktfunk_core.h");
 
     match cbindgen::generate(&crate_dir) {
         Ok(bindings) => {
             bindings.write_to_file(&out);
-            println!("cargo:warning=lumen-core: wrote {}", out.display());
+            println!("cargo:warning=punktfunk-core: wrote {}", out.display());
         }
         Err(e) => {
-            println!("cargo:warning=lumen-core: cbindgen failed ({e}); header not regenerated");
+            println!("cargo:warning=punktfunk-core: cbindgen failed ({e}); header not regenerated");
         }
     }
 }
diff --git a/crates/punktfunk-core/cbindgen.toml b/crates/punktfunk-core/cbindgen.toml
new file mode 100644
index 00000000..c3166667
--- /dev/null
+++ b/crates/punktfunk-core/cbindgen.toml
@@ -0,0 +1,56 @@
+language = "C"
+pragma_once = true
+include_guard = "PUNKTFUNK_CORE_H"
+autogen_warning = "/* Generated by cbindgen from punktfunk-core. Do not edit by hand. */"
+header = "/* punktfunk-core C ABI — see crates/punktfunk-core/src/abi.rs */"
+style = "type"
+cpp_compat = true
+tab_width = 4
+documentation = true
+documentation_style = "c99"
+
+[parse]
+parse_deps = false
+
+[export.rename]
+"InputEvent" = "PunktfunkInputEvent"
+"InputKind" = "PunktfunkInputKind"
+# Gamepad wire constants: bare BTN_* names collide with <linux/input-event-codes.h> (at
+# DIFFERENT values — last definition silently wins); prefix everything we export.
+"BTN_DPAD_UP" = "PUNKTFUNK_BTN_DPAD_UP"
+"BTN_DPAD_DOWN" = "PUNKTFUNK_BTN_DPAD_DOWN"
+"BTN_DPAD_LEFT" = "PUNKTFUNK_BTN_DPAD_LEFT"
+"BTN_DPAD_RIGHT" = "PUNKTFUNK_BTN_DPAD_RIGHT"
+"BTN_START" = "PUNKTFUNK_BTN_START"
+"BTN_BACK" = "PUNKTFUNK_BTN_BACK"
+"BTN_LS_CLICK" = "PUNKTFUNK_BTN_LS_CLICK"
+"BTN_RS_CLICK" = "PUNKTFUNK_BTN_RS_CLICK"
+"BTN_LB" = "PUNKTFUNK_BTN_LB"
+"BTN_RB" = "PUNKTFUNK_BTN_RB"
+"BTN_GUIDE" = "PUNKTFUNK_BTN_GUIDE"
+"BTN_A" = "PUNKTFUNK_BTN_A"
+"BTN_B" = "PUNKTFUNK_BTN_B"
+"BTN_X" = "PUNKTFUNK_BTN_X"
+"BTN_Y" = "PUNKTFUNK_BTN_Y"
+"AXIS_LS_X" = "PUNKTFUNK_AXIS_LS_X"
+"AXIS_LS_Y" = "PUNKTFUNK_AXIS_LS_Y"
+"AXIS_RS_X" = "PUNKTFUNK_AXIS_RS_X"
+"AXIS_RS_Y" = "PUNKTFUNK_AXIS_RS_Y"
+"AXIS_LT" = "PUNKTFUNK_AXIS_LT"
+"AXIS_RT" = "PUNKTFUNK_AXIS_RT"
+"AUDIO_MAGIC" = "PUNKTFUNK_AUDIO_MAGIC"
+"RUMBLE_MAGIC" = "PUNKTFUNK_RUMBLE_MAGIC"
+
+# QualifiedScreamingSnakeCase already qualifies each variant with the enum name
+# (PunktfunkStatus::Ok -> PUNKTFUNK_STATUS_OK); do NOT also set prefix_with_name or it doubles.
+[enum]
+rename_variants = "QualifiedScreamingSnakeCase"
+
+[fn]
+sort_by = "None"
+
+[struct]
+derive_eq = false
+
+[defines]
+"feature = quic" = "PUNKTFUNK_FEATURE_QUIC"
diff --git a/crates/lumen-core/src/abi.rs b/crates/punktfunk-core/src/abi.rs
similarity index 71%
rename from crates/lumen-core/src/abi.rs
rename to crates/punktfunk-core/src/abi.rs
index 94fe5556..de389491 100644
--- a/crates/lumen-core/src/abi.rs
+++ b/crates/punktfunk-core/src/abi.rs
@@ -1,17 +1,17 @@
 //! The stable `extern "C"` surface. `cbindgen` turns this module into
-//! `include/lumen_core.h` (see `build.rs`).
+//! `include/punktfunk_core.h` (see `build.rs`).
 //!
 //! ## Principles (plan §5)
-//! - Opaque handles only: C sees `LumenSession*`, never a Rust type's fields.
+//! - Opaque handles only: C sees `PunktfunkSession*`, never a Rust type's fields.
 //! - All cross-boundary structs are `#[repr(C)]`; buffers are pointer + length.
 //! - Explicit ownership: every handle from `*_new` / `*_pair` must be passed to
-//!   [`lumen_session_free`]. A [`LumenFrame`]'s `data` is borrowed until the next
+//!   [`punktfunk_session_free`]. A [`PunktfunkFrame`]'s `data` is borrowed until the next
 //!   `poll`/`free` on that session — copy it out before then.
-//! - Versioned: [`lumen_abi_version`] + `LumenConfig::struct_size` for forward-compat.
+//! - Versioned: [`punktfunk_abi_version`] + `PunktfunkConfig::struct_size` for forward-compat.
 //! - Panics never cross the boundary: every entry point is wrapped in `catch_unwind`.
 
 use crate::config::{Config, FecConfig, FecScheme, ProtocolPhase, Role};
-use crate::error::LumenStatus;
+use crate::error::PunktfunkStatus;
 use crate::input::InputEvent;
 use crate::session::Session;
 use crate::stats::Stats;
@@ -22,23 +22,23 @@ use std::panic::AssertUnwindSafe;
 use std::ptr;
 
 /// Opaque session handle. Pointer-only from C.
-pub struct LumenSession {
+pub struct PunktfunkSession {
     inner: Session,
-    /// Keeps the most recently polled frame alive so [`LumenFrame::data`] stays valid
+    /// Keeps the most recently polled frame alive so [`PunktfunkFrame::data`] stays valid
     /// until the next poll or free.
     last_frame: Option<crate::session::Frame>,
-    input_cb: Option<(LumenInputCb, *mut c_void)>,
+    input_cb: Option<(PunktfunkInputCb, *mut c_void)>,
 }
 
 /// Forward-compatible session configuration. The caller MUST set `struct_size` to
-/// `sizeof(LumenConfig)`; the core uses it to detect ABI skew.
+/// `sizeof(PunktfunkConfig)`; the core uses it to detect ABI skew.
 #[repr(C)]
 #[derive(Clone, Copy)]
-pub struct LumenConfig {
+pub struct PunktfunkConfig {
     pub struct_size: u32,
     /// 0 = host, 1 = client.
     pub role: u32,
-    /// 1 = P1 (GameStream-compatible), 2 = P2 (`lumen/1`).
+    /// 1 = P1 (GameStream-compatible), 2 = P2 (`punktfunk/1`).
     pub phase: u32,
     /// 0 = GF(2⁸), 1 = GF(2¹⁶).
     pub fec_scheme: u32,
@@ -55,27 +55,28 @@ pub struct LumenConfig {
     pub max_frame_bytes: u64,
 }
 
-impl LumenConfig {
-    fn to_config(self) -> Result<Config, LumenStatus> {
+impl PunktfunkConfig {
+    fn to_config(self) -> Result<Config, PunktfunkStatus> {
         let role = match self.role {
             0 => Role::Host,
             1 => Role::Client,
-            _ => return Err(LumenStatus::InvalidArg),
+            _ => return Err(PunktfunkStatus::InvalidArg),
         };
         let phase = match self.phase {
             1 => ProtocolPhase::P1GameStream,
-            2 => ProtocolPhase::P2Lumen,
-            _ => return Err(LumenStatus::InvalidArg),
+            2 => ProtocolPhase::P2Punktfunk,
+            _ => return Err(PunktfunkStatus::InvalidArg),
         };
         // Range-check before narrowing: a `300` fec_percent or `65600` block size must be
         // rejected, not silently truncated to a valid-looking value.
         let scheme = u8::try_from(self.fec_scheme)
             .ok()
             .and_then(FecScheme::from_u8)
-            .ok_or(LumenStatus::InvalidArg)?;
-        let fec_percent = u8::try_from(self.fec_percent).map_err(|_| LumenStatus::InvalidArg)?;
+            .ok_or(PunktfunkStatus::InvalidArg)?;
+        let fec_percent =
+            u8::try_from(self.fec_percent).map_err(|_| PunktfunkStatus::InvalidArg)?;
         let max_data_per_block =
-            u16::try_from(self.max_data_per_block).map_err(|_| LumenStatus::InvalidArg)?;
+            u16::try_from(self.max_data_per_block).map_err(|_| PunktfunkStatus::InvalidArg)?;
         let cfg = Config {
             role,
             phase,
@@ -96,28 +97,28 @@ impl LumenConfig {
     }
 }
 
-/// Read a `LumenConfig` from a caller pointer, enforcing the `struct_size` ABI-skew
+/// Read a `PunktfunkConfig` from a caller pointer, enforcing the `struct_size` ABI-skew
 /// guard *before* reading the whole struct: a caller compiled against a smaller (older)
 /// layout is rejected rather than causing an out-of-bounds read.
 ///
 /// # Safety
 /// `cfg` must either be null or point to at least its own declared `struct_size` bytes.
-unsafe fn config_from_ptr(cfg: *const LumenConfig) -> Result<Config, LumenStatus> {
+unsafe fn config_from_ptr(cfg: *const PunktfunkConfig) -> Result<Config, PunktfunkStatus> {
     if cfg.is_null() {
-        return Err(LumenStatus::NullPointer);
+        return Err(PunktfunkStatus::NullPointer);
     }
     // Read only the 4-byte size prefix first to bound the subsequent full read.
     let declared = unsafe { std::ptr::addr_of!((*cfg).struct_size).read_unaligned() } as usize;
-    if declared < std::mem::size_of::<LumenConfig>() {
-        return Err(LumenStatus::InvalidArg);
+    if declared < std::mem::size_of::<PunktfunkConfig>() {
+        return Err(PunktfunkStatus::InvalidArg);
     }
     unsafe { *cfg }.to_config()
 }
 
 /// A reassembled access unit. `data`/`len` borrow session-owned memory valid until the
-/// next `lumen_client_poll_frame`/`lumen_session_free` on the same session.
+/// next `punktfunk_client_poll_frame`/`punktfunk_session_free` on the same session.
 #[repr(C)]
-pub struct LumenFrame {
+pub struct PunktfunkFrame {
     pub data: *const u8,
     pub len: usize,
     pub frame_index: u32,
@@ -128,7 +129,7 @@ pub struct LumenFrame {
 /// Snapshot of session counters.
 #[repr(C)]
 #[derive(Clone, Copy, Default)]
-pub struct LumenStats {
+pub struct PunktfunkStats {
     pub frames_submitted: u64,
     pub frames_completed: u64,
     pub frames_dropped: u64,
@@ -140,9 +141,9 @@ pub struct LumenStats {
     pub bytes_received: u64,
 }
 
-impl From<Stats> for LumenStats {
+impl From<Stats> for PunktfunkStats {
     fn from(s: Stats) -> Self {
-        LumenStats {
+        PunktfunkStats {
             frames_submitted: s.frames_submitted,
             frames_completed: s.frames_completed,
             frames_dropped: s.frames_dropped,
@@ -156,16 +157,16 @@ impl From<Stats> for LumenStats {
     }
 }
 
-/// Host-side callback invoked for each input event drained by `lumen_host_poll_input`.
-pub type LumenInputCb = extern "C" fn(event: *const InputEvent, user: *mut c_void);
+/// Host-side callback invoked for each input event drained by `punktfunk_host_poll_input`.
+pub type PunktfunkInputCb = extern "C" fn(event: *const InputEvent, user: *mut c_void);
 
 #[inline]
-fn guard<F: FnOnce() -> LumenStatus>(f: F) -> LumenStatus {
-    std::panic::catch_unwind(AssertUnwindSafe(f)).unwrap_or(LumenStatus::Panic)
+fn guard<F: FnOnce() -> PunktfunkStatus>(f: F) -> PunktfunkStatus {
+    std::panic::catch_unwind(AssertUnwindSafe(f)).unwrap_or(PunktfunkStatus::Panic)
 }
 
-fn new_handle(session: Session) -> *mut LumenSession {
-    Box::into_raw(Box::new(LumenSession {
+fn new_handle(session: Session) -> *mut PunktfunkSession {
+    Box::into_raw(Box::new(PunktfunkSession {
         inner: session,
         last_frame: None,
         input_cb: None,
@@ -174,7 +175,7 @@ fn new_handle(session: Session) -> *mut LumenSession {
 
 /// Current ABI version. Mismatch with [`crate::ABI_VERSION`] means incompatible core.
 #[no_mangle]
-pub extern "C" fn lumen_abi_version() -> u32 {
+pub extern "C" fn punktfunk_abi_version() -> u32 {
     crate::ABI_VERSION
 }
 
@@ -184,11 +185,11 @@ pub extern "C" fn lumen_abi_version() -> u32 {
 /// # Safety
 /// `cfg`, `local`, `peer` must be valid pointers; the strings must be NUL-terminated.
 #[no_mangle]
-pub unsafe extern "C" fn lumen_session_new(
-    cfg: *const LumenConfig,
+pub unsafe extern "C" fn punktfunk_session_new(
+    cfg: *const PunktfunkConfig,
     local: *const c_char,
     peer: *const c_char,
-) -> *mut LumenSession {
+) -> *mut PunktfunkSession {
     let result = std::panic::catch_unwind(AssertUnwindSafe(|| {
         if cfg.is_null() || local.is_null() || peer.is_null() {
             return ptr::null_mut();
@@ -223,16 +224,16 @@ pub unsafe extern "C" fn lumen_session_new(
 /// # Safety
 /// All four pointers must be valid; the two out-params receive owned handles.
 #[no_mangle]
-pub unsafe extern "C" fn lumen_test_loopback_pair(
-    host_cfg: *const LumenConfig,
-    client_cfg: *const LumenConfig,
-    out_host: *mut *mut LumenSession,
-    out_client: *mut *mut LumenSession,
-) -> LumenStatus {
+pub unsafe extern "C" fn punktfunk_test_loopback_pair(
+    host_cfg: *const PunktfunkConfig,
+    client_cfg: *const PunktfunkConfig,
+    out_host: *mut *mut PunktfunkSession,
+    out_client: *mut *mut PunktfunkSession,
+) -> PunktfunkStatus {
     guard(|| {
         if host_cfg.is_null() || client_cfg.is_null() || out_host.is_null() || out_client.is_null()
         {
-            return LumenStatus::NullPointer;
+            return PunktfunkStatus::NullPointer;
         }
         let hconf = match unsafe { config_from_ptr(host_cfg) } {
             Ok(c) => c,
@@ -255,16 +256,16 @@ pub unsafe extern "C" fn lumen_test_loopback_pair(
             *out_host = new_handle(hs);
             *out_client = new_handle(cs);
         }
-        LumenStatus::Ok
+        PunktfunkStatus::Ok
     })
 }
 
 /// Free a session handle. Safe to call with NULL.
 ///
 /// # Safety
-/// `s` must be a handle from `lumen_session_new`/`lumen_test_loopback_pair`, freed once.
+/// `s` must be a handle from `punktfunk_session_new`/`punktfunk_test_loopback_pair`, freed once.
 #[no_mangle]
-pub unsafe extern "C" fn lumen_session_free(s: *mut LumenSession) {
+pub unsafe extern "C" fn punktfunk_session_free(s: *mut PunktfunkSession) {
     if !s.is_null() {
         drop(unsafe { Box::from_raw(s) });
     }
@@ -275,20 +276,20 @@ pub unsafe extern "C" fn lumen_session_free(s: *mut LumenSession) {
 /// # Safety
 /// `s` is a valid host handle; `data` points to `len` readable bytes (or `len == 0`).
 #[no_mangle]
-pub unsafe extern "C" fn lumen_host_submit_frame(
-    s: *mut LumenSession,
+pub unsafe extern "C" fn punktfunk_host_submit_frame(
+    s: *mut PunktfunkSession,
     data: *const u8,
     len: usize,
     pts_ns: u64,
     flags: u32,
-) -> LumenStatus {
+) -> PunktfunkStatus {
     guard(|| {
         let s = match unsafe { s.as_mut() } {
             Some(s) => s,
-            None => return LumenStatus::NullPointer,
+            None => return PunktfunkStatus::NullPointer,
         };
         if data.is_null() && len != 0 {
-            return LumenStatus::NullPointer;
+            return PunktfunkStatus::NullPointer;
         }
         let slice = if len == 0 {
             &[][..]
@@ -296,36 +297,36 @@ pub unsafe extern "C" fn lumen_host_submit_frame(
             unsafe { std::slice::from_raw_parts(data, len) }
         };
         match s.inner.submit_frame(slice, pts_ns, flags) {
-            Ok(()) => LumenStatus::Ok,
+            Ok(()) => PunktfunkStatus::Ok,
             Err(e) => e.status(),
         }
     })
 }
 
-/// Client: poll for the next reassembled access unit. Returns [`LumenStatus::NoFrame`]
+/// Client: poll for the next reassembled access unit. Returns [`PunktfunkStatus::NoFrame`]
 /// when nothing is ready yet. On `Ok`, `*out` borrows session memory until the next poll.
 ///
 /// # Safety
-/// `s` is a valid client handle; `out` points to a writable `LumenFrame`.
+/// `s` is a valid client handle; `out` points to a writable `PunktfunkFrame`.
 #[no_mangle]
-pub unsafe extern "C" fn lumen_client_poll_frame(
-    s: *mut LumenSession,
-    out: *mut LumenFrame,
-) -> LumenStatus {
+pub unsafe extern "C" fn punktfunk_client_poll_frame(
+    s: *mut PunktfunkSession,
+    out: *mut PunktfunkFrame,
+) -> PunktfunkStatus {
     guard(|| {
         let s = match unsafe { s.as_mut() } {
             Some(s) => s,
-            None => return LumenStatus::NullPointer,
+            None => return PunktfunkStatus::NullPointer,
         };
         if out.is_null() {
-            return LumenStatus::NullPointer;
+            return PunktfunkStatus::NullPointer;
         }
         match s.inner.poll_frame() {
             Ok(frame) => {
                 s.last_frame = Some(frame);
                 let f = s.last_frame.as_ref().unwrap();
                 unsafe {
-                    *out = LumenFrame {
+                    *out = PunktfunkFrame {
                         data: f.data.as_ptr(),
                         len: f.data.len(),
                         frame_index: f.frame_index,
@@ -333,7 +334,7 @@ pub unsafe extern "C" fn lumen_client_poll_frame(
                         flags: f.flags,
                     };
                 }
-                LumenStatus::Ok
+                PunktfunkStatus::Ok
             }
             Err(e) => e.status(),
         }
@@ -345,60 +346,60 @@ pub unsafe extern "C" fn lumen_client_poll_frame(
 /// # Safety
 /// `s` is a valid client handle; `ev` points to a valid [`InputEvent`].
 #[no_mangle]
-pub unsafe extern "C" fn lumen_send_input(
-    s: *mut LumenSession,
+pub unsafe extern "C" fn punktfunk_send_input(
+    s: *mut PunktfunkSession,
     ev: *const InputEvent,
-) -> LumenStatus {
+) -> PunktfunkStatus {
     guard(|| {
         let s = match unsafe { s.as_mut() } {
             Some(s) => s,
-            None => return LumenStatus::NullPointer,
+            None => return PunktfunkStatus::NullPointer,
         };
         let ev = match unsafe { ev.as_ref() } {
             Some(e) => e,
-            None => return LumenStatus::NullPointer,
+            None => return PunktfunkStatus::NullPointer,
         };
         match s.inner.send_input(ev) {
-            Ok(()) => LumenStatus::Ok,
+            Ok(()) => PunktfunkStatus::Ok,
             Err(e) => e.status(),
         }
     })
 }
 
 /// Register the host-side input callback (pass a NULL fn pointer to clear). The callback
-/// fires from within [`lumen_host_poll_input`], on the calling thread.
+/// fires from within [`punktfunk_host_poll_input`], on the calling thread.
 ///
 /// # Safety
 /// `s` is a valid host handle; `user` is passed back verbatim to `cb`.
 #[no_mangle]
-pub unsafe extern "C" fn lumen_set_input_callback(
-    s: *mut LumenSession,
-    // Written as an explicit `Option<fn>` (not the `LumenInputCb` alias) so cbindgen
+pub unsafe extern "C" fn punktfunk_set_input_callback(
+    s: *mut PunktfunkSession,
+    // Written as an explicit `Option<fn>` (not the `PunktfunkInputCb` alias) so cbindgen
     // emits a nullable C function pointer rather than an opaque wrapper struct.
     cb: Option<extern "C" fn(event: *const InputEvent, user: *mut c_void)>,
     user: *mut c_void,
-) -> LumenStatus {
+) -> PunktfunkStatus {
     guard(|| {
         let s = match unsafe { s.as_mut() } {
             Some(s) => s,
-            None => return LumenStatus::NullPointer,
+            None => return PunktfunkStatus::NullPointer,
         };
         s.input_cb = cb.map(|c| (c, user));
-        LumenStatus::Ok
+        PunktfunkStatus::Ok
     })
 }
 
 /// Host: drain all pending input events, invoking the registered callback for each.
-/// Returns the count dispatched (≥ 0), or a negative [`LumenStatus`] on error.
+/// Returns the count dispatched (≥ 0), or a negative [`PunktfunkStatus`] on error.
 ///
 /// # Safety
 /// `s` is a valid host handle.
 #[no_mangle]
-pub unsafe extern "C" fn lumen_host_poll_input(s: *mut LumenSession) -> i32 {
+pub unsafe extern "C" fn punktfunk_host_poll_input(s: *mut PunktfunkSession) -> i32 {
     let r = std::panic::catch_unwind(AssertUnwindSafe(|| {
         let s = match unsafe { s.as_mut() } {
             Some(s) => s,
-            None => return LumenStatus::NullPointer as i32,
+            None => return PunktfunkStatus::NullPointer as i32,
         };
         let cb = s.input_cb;
         let mut count = 0i32;
@@ -416,39 +417,39 @@ pub unsafe extern "C" fn lumen_host_poll_input(s: *mut LumenSession) -> i32 {
         }
         count
     }));
-    r.unwrap_or(LumenStatus::Panic as i32)
+    r.unwrap_or(PunktfunkStatus::Panic as i32)
 }
 
 /// Copy session counters into `*out`.
 ///
 /// # Safety
-/// `s` is a valid handle; `out` points to a writable `LumenStats`.
+/// `s` is a valid handle; `out` points to a writable `PunktfunkStats`.
 #[no_mangle]
-pub unsafe extern "C" fn lumen_get_stats(
-    s: *mut LumenSession,
-    out: *mut LumenStats,
-) -> LumenStatus {
+pub unsafe extern "C" fn punktfunk_get_stats(
+    s: *mut PunktfunkSession,
+    out: *mut PunktfunkStats,
+) -> PunktfunkStatus {
     guard(|| {
         let s = match unsafe { s.as_ref() } {
             Some(s) => s,
-            None => return LumenStatus::NullPointer,
+            None => return PunktfunkStatus::NullPointer,
         };
         if out.is_null() {
-            return LumenStatus::NullPointer;
+            return PunktfunkStatus::NullPointer;
         }
         let stats = s.inner.stats();
-        unsafe { *out = LumenStats::from(stats) };
-        LumenStatus::Ok
+        unsafe { *out = PunktfunkStats::from(stats) };
+        PunktfunkStatus::Ok
     })
 }
 
 // ---------------------------------------------------------------------------------------------
-// lumen/1 connection API (`quic` feature) — the embeddable client connector platform clients
+// punktfunk/1 connection API (`quic` feature) — the embeddable client connector platform clients
 // link (SwiftUI/VideoToolbox, Android, …). In the generated header these are guarded by
-// `LUMEN_FEATURE_QUIC`; define it when linking a lumen-core built with `--features quic`.
+// `PUNKTFUNK_FEATURE_QUIC`; define it when linking a punktfunk-core built with `--features quic`.
 // ---------------------------------------------------------------------------------------------
 
-/// Opaque handle to a live `lumen/1` connection (QUIC control plane + UDP data plane, all
+/// Opaque handle to a live `punktfunk/1` connection (QUIC control plane + UDP data plane, all
 /// pumped on internal threads).
 ///
 /// Thread contract: each plane (video `next_au`, audio `next_audio`, rumble `next_rumble`)
@@ -456,15 +457,15 @@ pub unsafe extern "C" fn lumen_get_stats(
 /// take shared references internally (per-plane mutexed borrow slots), so cross-plane
 /// concurrency is sound — never two threads on the *same* plane.
 #[cfg(feature = "quic")]
-pub struct LumenConnection {
+pub struct PunktfunkConnection {
     inner: crate::client::NativeClient,
-    /// Backs the pointer returned by the last `lumen_connection_next_au` (borrow-until-next-call).
+    /// Backs the pointer returned by the last `punktfunk_connection_next_au` (borrow-until-next-call).
     last: std::sync::Mutex<Option<crate::session::Frame>>,
-    /// Same, for `lumen_connection_next_audio` (independent of the video slot).
+    /// Same, for `punktfunk_connection_next_audio` (independent of the video slot).
     last_audio: std::sync::Mutex<Option<crate::client::AudioPacket>>,
 }
 
-/// Connect to a `lumen/1` host and start a session at `width`x`height`@`refresh_hz`.
+/// Connect to a `punktfunk/1` host and start a session at `width`x`height`@`refresh_hz`.
 /// Blocks up to `timeout_ms` for the handshake. Returns NULL on failure.
 ///
 /// Trust: `pin_sha256` (NULL or 32 bytes) is the expected SHA-256 fingerprint of the host's
@@ -477,7 +478,7 @@ pub struct LumenConnection {
 /// `pin_sha256`/`observed_sha256_out` are each NULL or valid for 32 bytes.
 #[cfg(feature = "quic")]
 #[no_mangle]
-pub unsafe extern "C" fn lumen_connect(
+pub unsafe extern "C" fn punktfunk_connect(
     host: *const std::os::raw::c_char,
     port: u16,
     width: u32,
@@ -486,7 +487,7 @@ pub unsafe extern "C" fn lumen_connect(
     pin_sha256: *const u8,
     observed_sha256_out: *mut u8,
     timeout_ms: u32,
-) -> *mut LumenConnection {
+) -> *mut PunktfunkConnection {
     let r = std::panic::catch_unwind(AssertUnwindSafe(|| {
         if host.is_null() {
             return std::ptr::null_mut();
@@ -521,7 +522,7 @@ pub unsafe extern "C" fn lumen_connect(
                             .copy_from_slice(&c.host_fingerprint);
                     }
                 }
-                Box::into_raw(Box::new(LumenConnection {
+                Box::into_raw(Box::new(PunktfunkConnection {
                     inner: c,
                     last: std::sync::Mutex::new(None),
                     last_audio: std::sync::Mutex::new(None),
@@ -534,7 +535,7 @@ pub unsafe extern "C" fn lumen_connect(
 }
 
 /// Pull the next reassembled access unit, waiting up to `timeout_ms`. Returns
-/// [`LumenStatus::NoFrame`] on timeout and [`LumenStatus::Closed`] once the session ended.
+/// [`PunktfunkStatus::NoFrame`] on timeout and [`PunktfunkStatus::Closed`] once the session ended.
 /// On `Ok`, `*out` borrows connection memory **until the next `next_au` call** on this
 /// handle (the audio/rumble planes do not invalidate it).
 ///
@@ -543,19 +544,19 @@ pub unsafe extern "C" fn lumen_connect(
 /// it may run concurrently with one audio-pulling and one rumble-pulling thread.
 #[cfg(feature = "quic")]
 #[no_mangle]
-pub unsafe extern "C" fn lumen_connection_next_au(
-    c: *mut LumenConnection,
-    out: *mut LumenFrame,
+pub unsafe extern "C" fn punktfunk_connection_next_au(
+    c: *mut PunktfunkConnection,
+    out: *mut PunktfunkFrame,
     timeout_ms: u32,
-) -> LumenStatus {
+) -> PunktfunkStatus {
     guard(|| {
         // Shared reference only: video and audio threads must never alias a `&mut`.
         let c = match unsafe { c.as_ref() } {
             Some(c) => c,
-            None => return LumenStatus::NullPointer,
+            None => return PunktfunkStatus::NullPointer,
         };
         if out.is_null() {
-            return LumenStatus::NullPointer;
+            return PunktfunkStatus::NullPointer;
         }
         match c
             .inner
@@ -566,7 +567,7 @@ pub unsafe extern "C" fn lumen_connection_next_au(
                 *slot = Some(frame);
                 let f = slot.as_ref().unwrap();
                 unsafe {
-                    *out = LumenFrame {
+                    *out = PunktfunkFrame {
                         data: f.data.as_ptr(),
                         len: f.data.len(),
                         frame_index: f.frame_index,
@@ -574,18 +575,18 @@ pub unsafe extern "C" fn lumen_connection_next_au(
                         flags: f.flags,
                     };
                 }
-                LumenStatus::Ok
+                PunktfunkStatus::Ok
             }
             Err(e) => e.status(),
         }
     })
 }
 
-/// One Opus audio packet pulled off a `lumen/1` connection (48 kHz stereo, 5 ms frames).
-/// `data` borrows connection memory until the next `lumen_connection_next_audio` call.
+/// One Opus audio packet pulled off a `punktfunk/1` connection (48 kHz stereo, 5 ms frames).
+/// `data` borrows connection memory until the next `punktfunk_connection_next_audio` call.
 #[cfg(feature = "quic")]
 #[repr(C)]
-pub struct LumenAudioPacket {
+pub struct PunktfunkAudioPacket {
     pub data: *const u8,
     pub len: usize,
     pub seq: u32,
@@ -593,7 +594,7 @@ pub struct LumenAudioPacket {
 }
 
 /// Pull the next Opus audio packet, waiting up to `timeout_ms`. Returns
-/// [`LumenStatus::NoFrame`] on timeout and [`LumenStatus::Closed`] once the session ended.
+/// [`PunktfunkStatus::NoFrame`] on timeout and [`PunktfunkStatus::Closed`] once the session ended.
 /// On `Ok`, `out->data` borrows connection memory **until the next audio call** on this
 /// handle (independent of the video slot). Drain from a dedicated audio thread — packets
 /// arrive every 5 ms and the internal queue holds 320 ms.
@@ -603,18 +604,18 @@ pub struct LumenAudioPacket {
 /// it may run concurrently with the video/rumble pullers.
 #[cfg(feature = "quic")]
 #[no_mangle]
-pub unsafe extern "C" fn lumen_connection_next_audio(
-    c: *mut LumenConnection,
-    out: *mut LumenAudioPacket,
+pub unsafe extern "C" fn punktfunk_connection_next_audio(
+    c: *mut PunktfunkConnection,
+    out: *mut PunktfunkAudioPacket,
     timeout_ms: u32,
-) -> LumenStatus {
+) -> PunktfunkStatus {
     guard(|| {
         let c = match unsafe { c.as_ref() } {
             Some(c) => c,
-            None => return LumenStatus::NullPointer,
+            None => return PunktfunkStatus::NullPointer,
         };
         if out.is_null() {
-            return LumenStatus::NullPointer;
+            return PunktfunkStatus::NullPointer;
         }
         match c
             .inner
@@ -625,14 +626,14 @@ pub unsafe extern "C" fn lumen_connection_next_audio(
                 *slot = Some(pkt);
                 let p = slot.as_ref().unwrap();
                 unsafe {
-                    *out = LumenAudioPacket {
+                    *out = PunktfunkAudioPacket {
                         data: p.data.as_ptr(),
                         len: p.data.len(),
                         seq: p.seq,
                         pts_ns: p.pts_ns,
                     };
                 }
-                LumenStatus::Ok
+                PunktfunkStatus::Ok
             }
             Err(e) => e.status(),
         }
@@ -641,24 +642,24 @@ pub unsafe extern "C" fn lumen_connection_next_audio(
 
 /// Pull the next rumble (force-feedback) update, waiting up to `timeout_ms`. Amplitudes
 /// are 0..0xFFFF (`low` = low-frequency motor, `high` = high-frequency), `(0, 0)` = stop.
-/// Same timeout/closed semantics as [`lumen_connection_next_audio`].
+/// Same timeout/closed semantics as [`punktfunk_connection_next_audio`].
 ///
 /// # Safety
 /// `c` is a valid connection handle; out pointers are writable (NULLs are skipped). At
 /// most one thread pulls rumble — it may run concurrently with the video/audio pullers.
 #[cfg(feature = "quic")]
 #[no_mangle]
-pub unsafe extern "C" fn lumen_connection_next_rumble(
-    c: *mut LumenConnection,
+pub unsafe extern "C" fn punktfunk_connection_next_rumble(
+    c: *mut PunktfunkConnection,
     pad: *mut u16,
     low: *mut u16,
     high: *mut u16,
     timeout_ms: u32,
-) -> LumenStatus {
+) -> PunktfunkStatus {
     guard(|| {
         let c = match unsafe { c.as_ref() } {
             Some(c) => c,
-            None => return LumenStatus::NullPointer,
+            None => return PunktfunkStatus::NullPointer,
         };
         match c
             .inner
@@ -676,7 +677,7 @@ pub unsafe extern "C" fn lumen_connection_next_rumble(
                         *high = h;
                     }
                 }
-                LumenStatus::Ok
+                PunktfunkStatus::Ok
             }
             Err(e) => e.status(),
         }
@@ -689,21 +690,21 @@ pub unsafe extern "C" fn lumen_connection_next_rumble(
 /// `c` is a valid connection handle; `ev` points to a valid [`InputEvent`].
 #[cfg(feature = "quic")]
 #[no_mangle]
-pub unsafe extern "C" fn lumen_connection_send_input(
-    c: *mut LumenConnection,
+pub unsafe extern "C" fn punktfunk_connection_send_input(
+    c: *mut PunktfunkConnection,
     ev: *const InputEvent,
-) -> LumenStatus {
+) -> PunktfunkStatus {
     guard(|| {
         let c = match unsafe { c.as_ref() } {
             Some(c) => c,
-            None => return LumenStatus::NullPointer,
+            None => return PunktfunkStatus::NullPointer,
         };
         let ev = match unsafe { ev.as_ref() } {
             Some(e) => e,
-            None => return LumenStatus::NullPointer,
+            None => return PunktfunkStatus::NullPointer,
         };
         match c.inner.send_input(ev) {
-            Ok(()) => LumenStatus::Ok,
+            Ok(()) => PunktfunkStatus::Ok,
             Err(e) => e.status(),
         }
     })
@@ -715,16 +716,16 @@ pub unsafe extern "C" fn lumen_connection_send_input(
 /// `c` is a valid connection handle; out pointers are writable (NULLs are skipped).
 #[cfg(feature = "quic")]
 #[no_mangle]
-pub unsafe extern "C" fn lumen_connection_mode(
-    c: *const LumenConnection,
+pub unsafe extern "C" fn punktfunk_connection_mode(
+    c: *const PunktfunkConnection,
     width: *mut u32,
     height: *mut u32,
     refresh_hz: *mut u32,
-) -> LumenStatus {
+) -> PunktfunkStatus {
     guard(|| {
         let c = match unsafe { c.as_ref() } {
             Some(c) => c,
-            None => return LumenStatus::NullPointer,
+            None => return PunktfunkStatus::NullPointer,
         };
         unsafe {
             if !width.is_null() {
@@ -737,17 +738,17 @@ pub unsafe extern "C" fn lumen_connection_mode(
                 *refresh_hz = c.inner.mode.refresh_hz;
             }
         }
-        LumenStatus::Ok
+        PunktfunkStatus::Ok
     })
 }
 
 /// Close the connection and free the handle (joins the internal threads). NULL is a no-op.
 ///
 /// # Safety
-/// `c` was returned by [`lumen_connect`] and is not used after this call.
+/// `c` was returned by [`punktfunk_connect`] and is not used after this call.
 #[cfg(feature = "quic")]
 #[no_mangle]
-pub unsafe extern "C" fn lumen_connection_close(c: *mut LumenConnection) {
+pub unsafe extern "C" fn punktfunk_connection_close(c: *mut PunktfunkConnection) {
     if !c.is_null() {
         drop(unsafe { Box::from_raw(c) });
     }
diff --git a/crates/lumen-core/src/client.rs b/crates/punktfunk-core/src/client.rs
similarity index 84%
rename from crates/lumen-core/src/client.rs
rename to crates/punktfunk-core/src/client.rs
index 39979867..2c329e20 100644
--- a/crates/lumen-core/src/client.rs
+++ b/crates/punktfunk-core/src/client.rs
@@ -1,10 +1,10 @@
-//! The embeddable `lumen/1` client connector (M4 groundwork), behind the `quic` feature.
+//! The embeddable `punktfunk/1` client connector (M4 groundwork), behind the `quic` feature.
 //!
 //! [`NativeClient::connect`] runs the full client side of the protocol — QUIC handshake
 //! ([`crate::quic`]), UDP data plane ([`crate::session::Session`] on a native thread), input
 //! datagrams — and hands the embedder a dead-simple surface: *pull reassembled access units,
 //! push input events*. This is what the platform clients (SwiftUI/VideoToolbox, Android, …)
-//! link via the C ABI (`lumen_connect` & co. in [`crate::abi`]); `lumen-client-rs` is the
+//! link via the C ABI (`punktfunk_connect` & co. in [`crate::abi`]); `punktfunk-client-rs` is the
 //! Rust-native consumer of the same flow.
 //!
 //! Threading: one worker thread owns a tokio runtime (QUIC control plane only — design
@@ -12,7 +12,7 @@
 //! channel. All methods are safe to call from any single embedder thread.
 
 use crate::config::{Mode, Role};
-use crate::error::{LumenError, Result};
+use crate::error::{PunktfunkError, Result};
 use crate::input::InputEvent;
 use crate::quic::{endpoint, io, Hello, Start, Welcome};
 use crate::session::{Frame, Session};
@@ -60,11 +60,11 @@ pub struct NativeClient {
 }
 
 impl NativeClient {
-    /// Connect to a `lumen/1` host and start the session at (up to) `mode`. Blocks until the
+    /// Connect to a `punktfunk/1` host and start the session at (up to) `mode`. Blocks until the
     /// handshake completes or `timeout` elapses.
     ///
     /// `pin`: expected SHA-256 of the host's certificate. `Some` and the host presents
-    /// anything else → the handshake is rejected ([`LumenError::Crypto`]). `None` = trust on
+    /// anything else → the handshake is rejected ([`PunktfunkError::Crypto`]). `None` = trust on
     /// first use; check [`NativeClient::host_fingerprint`] after connecting.
     pub fn connect(
         host: &str,
@@ -83,7 +83,7 @@ impl NativeClient {
         let host = host.to_string();
         let shutdown_w = shutdown.clone();
         let worker = std::thread::Builder::new()
-            .name("lumen-client".into())
+            .name("punktfunk-client".into())
             .spawn(move || {
                 let rt = match tokio::runtime::Builder::new_multi_thread()
                     .worker_threads(2)
@@ -92,7 +92,7 @@ impl NativeClient {
                 {
                     Ok(rt) => rt,
                     Err(e) => {
-                        let _ = ready_tx.send(Err(LumenError::Io(e)));
+                        let _ = ready_tx.send(Err(PunktfunkError::Io(e)));
                         return;
                     }
                 };
@@ -109,14 +109,14 @@ impl NativeClient {
                     shutdown: shutdown_w,
                 }));
             })
-            .map_err(LumenError::Io)?;
+            .map_err(PunktfunkError::Io)?;
 
         let (negotiated, fingerprint) = match ready_rx.recv_timeout(timeout) {
             Ok(Ok(t)) => t,
             Ok(Err(e)) => return Err(e),
             Err(_) => {
                 shutdown.store(true, Ordering::SeqCst);
-                return Err(LumenError::Timeout);
+                return Err(PunktfunkError::Timeout);
             }
         };
         Ok(NativeClient {
@@ -131,8 +131,8 @@ impl NativeClient {
         })
     }
 
-    /// Pull the next reassembled, FEC-recovered access unit; [`LumenError::NoFrame`] on
-    /// timeout, [`LumenError::Closed`]-class errors once the session ended.
+    /// Pull the next reassembled, FEC-recovered access unit; [`PunktfunkError::NoFrame`] on
+    /// timeout, [`PunktfunkError::Closed`]-class errors once the session ended.
     ///
     /// Plane concurrency: each pull method drains its own queue, so video, audio and
     /// rumble may each be pulled from their own thread — but at most one thread per plane
@@ -141,19 +141,19 @@ impl NativeClient {
     pub fn next_frame(&self, timeout: Duration) -> Result<Frame> {
         match self.frames.recv_timeout(timeout) {
             Ok(f) => Ok(f),
-            Err(RecvTimeoutError::Timeout) => Err(LumenError::NoFrame),
-            Err(RecvTimeoutError::Disconnected) => Err(LumenError::Closed),
+            Err(RecvTimeoutError::Timeout) => Err(PunktfunkError::NoFrame),
+            Err(RecvTimeoutError::Disconnected) => Err(PunktfunkError::Closed),
         }
     }
 
-    /// Pull the next Opus audio packet; [`LumenError::NoFrame`] on timeout,
-    /// [`LumenError::Closed`] once the session ended. Drain on a dedicated audio thread —
+    /// Pull the next Opus audio packet; [`PunktfunkError::NoFrame`] on timeout,
+    /// [`PunktfunkError::Closed`] once the session ended. Drain on a dedicated audio thread —
     /// packets arrive every 5 ms.
     pub fn next_audio(&self, timeout: Duration) -> Result<AudioPacket> {
         match self.audio.recv_timeout(timeout) {
             Ok(p) => Ok(p),
-            Err(RecvTimeoutError::Timeout) => Err(LumenError::NoFrame),
-            Err(RecvTimeoutError::Disconnected) => Err(LumenError::Closed),
+            Err(RecvTimeoutError::Timeout) => Err(PunktfunkError::NoFrame),
+            Err(RecvTimeoutError::Disconnected) => Err(PunktfunkError::Closed),
         }
     }
 
@@ -162,14 +162,14 @@ impl NativeClient {
     pub fn next_rumble(&self, timeout: Duration) -> Result<(u16, u16, u16)> {
         match self.rumble.recv_timeout(timeout) {
             Ok(r) => Ok(r),
-            Err(RecvTimeoutError::Timeout) => Err(LumenError::NoFrame),
-            Err(RecvTimeoutError::Disconnected) => Err(LumenError::Closed),
+            Err(RecvTimeoutError::Timeout) => Err(PunktfunkError::NoFrame),
+            Err(RecvTimeoutError::Disconnected) => Err(PunktfunkError::Closed),
         }
     }
 
     /// Queue one input event for delivery as a QUIC datagram.
     pub fn send_input(&self, ev: &InputEvent) -> Result<()> {
-        self.input_tx.send(*ev).map_err(|_| LumenError::Closed)
+        self.input_tx.send(*ev).map_err(|_| PunktfunkError::Closed)
     }
 }
 
@@ -212,12 +212,12 @@ async fn worker_main(args: WorkerArgs) {
     let setup = async {
         let remote: std::net::SocketAddr = format!("{host}:{port}")
             .parse()
-            .map_err(|_| LumenError::InvalidArg("host:port"))?;
+            .map_err(|_| PunktfunkError::InvalidArg("host:port"))?;
         let (ep, observed) = endpoint::client_pinned(pin);
-        let ep = ep.map_err(|e| LumenError::Io(std::io::Error::other(e.to_string())))?;
+        let ep = ep.map_err(|e| PunktfunkError::Io(std::io::Error::other(e.to_string())))?;
         let conn = ep
-            .connect(remote, "lumen")
-            .map_err(|_| LumenError::InvalidArg("connect"))?
+            .connect(remote, "punktfunk")
+            .map_err(|_| PunktfunkError::InvalidArg("connect"))?
             .await
             .map_err(|e| {
                 // A pin mismatch surfaces as a TLS failure; report it as a crypto error so
@@ -225,16 +225,16 @@ async fn worker_main(args: WorkerArgs) {
                 let fp_mismatch = pin.is_some()
                     && observed.lock().unwrap().map(|fp| Some(fp) != pin) == Some(true);
                 if fp_mismatch {
-                    LumenError::Crypto
+                    PunktfunkError::Crypto
                 } else {
-                    LumenError::Io(std::io::Error::other(e.to_string()))
+                    PunktfunkError::Io(std::io::Error::other(e.to_string()))
                 }
             })?;
         let fingerprint = observed.lock().unwrap().unwrap_or([0u8; 32]);
         let (mut send, mut recv) = conn
             .open_bi()
             .await
-            .map_err(|e| LumenError::Io(std::io::Error::other(e.to_string())))?;
+            .map_err(|e| PunktfunkError::Io(std::io::Error::other(e.to_string())))?;
 
         io::write_msg(
             &mut send,
@@ -264,7 +264,7 @@ async fn worker_main(args: WorkerArgs) {
         let transport =
             UdpTransport::connect(&format!("0.0.0.0:{udp_port}"), &host_udp.to_string())?;
         let session = Session::new(welcome.session_config(Role::Client), Box::new(transport))?;
-        Ok::<_, LumenError>((conn, session, welcome.mode, fingerprint))
+        Ok::<_, PunktfunkError>((conn, session, welcome.mode, fingerprint))
     };
 
     let (conn, mut session, negotiated, fingerprint) = match setup.await {
@@ -328,7 +328,7 @@ async fn worker_main(args: WorkerArgs) {
                 Ok(frame) => {
                     let _ = frame_tx.try_send(frame);
                 }
-                Err(LumenError::NoFrame) => {
+                Err(PunktfunkError::NoFrame) => {
                     std::thread::sleep(Duration::from_micros(300));
                 }
                 Err(_) => break,
diff --git a/crates/lumen-core/src/config.rs b/crates/punktfunk-core/src/config.rs
similarity index 92%
rename from crates/lumen-core/src/config.rs
rename to crates/punktfunk-core/src/config.rs
index ed303a53..feae7ef9 100644
--- a/crates/lumen-core/src/config.rs
+++ b/crates/punktfunk-core/src/config.rs
@@ -1,6 +1,6 @@
 //! Session configuration and protocol/FEC parameters.
 
-use crate::error::{LumenError, Result};
+use crate::error::{PunktfunkError, Result};
 use crate::packet::{CRYPTO_OVERHEAD, HEADER_LEN, MAX_DATAGRAM_BYTES};
 use zeroize::Zeroize;
 
@@ -13,12 +13,12 @@ pub enum Role {
 }
 
 /// Negotiated protocol generation. P1 is GameStream-compatible (GF(2⁸)); P2 is the
-/// `lumen/1` extension (GF(2¹⁶), multi-block framing, optional QUIC control).
+/// `punktfunk/1` extension (GF(2¹⁶), multi-block framing, optional QUIC control).
 #[repr(C)]
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum ProtocolPhase {
     P1GameStream = 1,
-    P2Lumen = 2,
+    P2Punktfunk = 2,
 }
 
 /// Erasure-coding field. Mirrors the on-wire `fec_scheme` tag.
@@ -141,38 +141,40 @@ impl Config {
     /// is what keeps the receive-side parser's allocations bounded.
     pub fn validate(&self) -> Result<()> {
         if self.shard_payload == 0 || self.shard_payload % 2 != 0 {
-            return Err(LumenError::InvalidArg("shard_payload must be even and > 0"));
+            return Err(PunktfunkError::InvalidArg(
+                "shard_payload must be even and > 0",
+            ));
         }
         if self.shard_payload > max_shard_payload() {
-            return Err(LumenError::InvalidArg(
+            return Err(PunktfunkError::InvalidArg(
                 "shard_payload too large to fit a datagram (header + crypto overhead)",
             ));
         }
         if self.fec.max_data_per_block == 0 {
-            return Err(LumenError::InvalidArg("max_data_per_block must be > 0"));
+            return Err(PunktfunkError::InvalidArg("max_data_per_block must be > 0"));
         }
         // The per-block total (data + recovery) must fit both the field ceiling and the
         // u16 wire fields.
         let k = self.fec.max_data_per_block as usize;
         let total = k + self.fec.recovery_for(k);
         if total > self.fec.scheme.max_total_shards() {
-            return Err(LumenError::InvalidArg(
+            return Err(PunktfunkError::InvalidArg(
                 "max_data_per_block + recovery exceeds the FEC scheme's shard ceiling",
             ));
         }
         if self.max_frame_bytes == 0 {
-            return Err(LumenError::InvalidArg("max_frame_bytes must be > 0"));
+            return Err(PunktfunkError::InvalidArg("max_frame_bytes must be > 0"));
         }
         // The frame must not need more FEC blocks than the u16 block-count field allows.
         let total_data = self.max_frame_bytes.div_ceil(self.shard_payload).max(1);
         let max_blocks = total_data.div_ceil(k).max(1);
         if max_blocks > u16::MAX as usize {
-            return Err(LumenError::InvalidArg(
+            return Err(PunktfunkError::InvalidArg(
                 "max_frame_bytes too large for this shard/block configuration (block count overflows u16)",
             ));
         }
         if self.encrypt && self.key == [0u8; 16] {
-            return Err(LumenError::InvalidArg(
+            return Err(PunktfunkError::InvalidArg(
                 "encrypt requires a non-zero session key (see crypto nonce-uniqueness contract)",
             ));
         }
diff --git a/crates/lumen-core/src/crypto.rs b/crates/punktfunk-core/src/crypto.rs
similarity index 97%
rename from crates/lumen-core/src/crypto.rs
rename to crates/punktfunk-core/src/crypto.rs
index 2917096d..2ec5d637 100644
--- a/crates/lumen-core/src/crypto.rs
+++ b/crates/punktfunk-core/src/crypto.rs
@@ -19,7 +19,7 @@
 //! nonce. Note: this layer does not provide anti-replay — see `Session`.
 
 use crate::config::Role;
-use crate::error::{LumenError, Result};
+use crate::error::{PunktfunkError, Result};
 use aes_gcm::aead::{Aead, KeyInit, Payload};
 use aes_gcm::{Aes128Gcm, Key, Nonce};
 
@@ -57,7 +57,7 @@ impl SessionCrypto {
                     aad: &seq.to_be_bytes(),
                 },
             )
-            .map_err(|_| LumenError::Crypto)
+            .map_err(|_| PunktfunkError::Crypto)
     }
 
     /// Open `ciphertext || tag` for sequence `seq` (also bound as associated data).
@@ -71,7 +71,7 @@ impl SessionCrypto {
                     aad: &seq.to_be_bytes(),
                 },
             )
-            .map_err(|_| LumenError::Crypto)
+            .map_err(|_| PunktfunkError::Crypto)
     }
 }
 
diff --git a/crates/lumen-core/src/error.rs b/crates/punktfunk-core/src/error.rs
similarity index 56%
rename from crates/lumen-core/src/error.rs
rename to crates/punktfunk-core/src/error.rs
index f383c108..e299e7dc 100644
--- a/crates/lumen-core/src/error.rs
+++ b/crates/punktfunk-core/src/error.rs
@@ -2,9 +2,9 @@
 
 use thiserror::Error;
 
-/// The core's internal error type. Crosses the C ABI as a [`LumenStatus`] code.
+/// The core's internal error type. Crosses the C ABI as a [`PunktfunkStatus`] code.
 #[derive(Debug, Error)]
-pub enum LumenError {
+pub enum PunktfunkError {
     #[error("invalid argument: {0}")]
     InvalidArg(&'static str),
     #[error("fec error: {0}")]
@@ -25,13 +25,13 @@ pub enum LumenError {
     Closed,
 }
 
-pub type Result<T> = core::result::Result<T, LumenError>;
+pub type Result<T> = core::result::Result<T, PunktfunkError>;
 
 /// Stable C ABI status codes. `Ok` is 0; all errors are negative so callers can
 /// test `rc < 0`. Do not renumber existing variants — only append.
 #[repr(i32)]
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum LumenStatus {
+pub enum PunktfunkStatus {
     Ok = 0,
     InvalidArg = -1,
     Fec = -2,
@@ -46,19 +46,19 @@ pub enum LumenStatus {
     Panic = -99,
 }
 
-impl LumenError {
+impl PunktfunkError {
     /// Map to the C ABI status code.
-    pub fn status(&self) -> LumenStatus {
+    pub fn status(&self) -> PunktfunkStatus {
         match self {
-            LumenError::InvalidArg(_) => LumenStatus::InvalidArg,
-            LumenError::Fec(_) => LumenStatus::Fec,
-            LumenError::Crypto => LumenStatus::Crypto,
-            LumenError::BadPacket => LumenStatus::BadPacket,
-            LumenError::NoFrame => LumenStatus::NoFrame,
-            LumenError::Unsupported(_) => LumenStatus::Unsupported,
-            LumenError::Io(_) => LumenStatus::Io,
-            LumenError::Timeout => LumenStatus::Timeout,
-            LumenError::Closed => LumenStatus::Closed,
+            PunktfunkError::InvalidArg(_) => PunktfunkStatus::InvalidArg,
+            PunktfunkError::Fec(_) => PunktfunkStatus::Fec,
+            PunktfunkError::Crypto => PunktfunkStatus::Crypto,
+            PunktfunkError::BadPacket => PunktfunkStatus::BadPacket,
+            PunktfunkError::NoFrame => PunktfunkStatus::NoFrame,
+            PunktfunkError::Unsupported(_) => PunktfunkStatus::Unsupported,
+            PunktfunkError::Io(_) => PunktfunkStatus::Io,
+            PunktfunkError::Timeout => PunktfunkStatus::Timeout,
+            PunktfunkError::Closed => PunktfunkStatus::Closed,
         }
     }
 }
diff --git a/crates/lumen-core/src/fec/gf16.rs b/crates/punktfunk-core/src/fec/gf16.rs
similarity index 100%
rename from crates/lumen-core/src/fec/gf16.rs
rename to crates/punktfunk-core/src/fec/gf16.rs
diff --git a/crates/lumen-core/src/fec/gf8.rs b/crates/punktfunk-core/src/fec/gf8.rs
similarity index 100%
rename from crates/lumen-core/src/fec/gf8.rs
rename to crates/punktfunk-core/src/fec/gf8.rs
diff --git a/crates/lumen-core/src/fec/mod.rs b/crates/punktfunk-core/src/fec/mod.rs
similarity index 100%
rename from crates/lumen-core/src/fec/mod.rs
rename to crates/punktfunk-core/src/fec/mod.rs
diff --git a/crates/lumen-core/src/input.rs b/crates/punktfunk-core/src/input.rs
similarity index 99%
rename from crates/lumen-core/src/input.rs
rename to crates/punktfunk-core/src/input.rs
index d1e7434f..84a38ca2 100644
--- a/crates/lumen-core/src/input.rs
+++ b/crates/punktfunk-core/src/input.rs
@@ -85,7 +85,7 @@ impl InputKind {
 }
 
 /// A single input event. `#[repr(C)]` — shared verbatim with the C ABI as
-/// `LumenInputEvent`.
+/// `PunktfunkInputEvent`.
 #[repr(C)]
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub struct InputEvent {
diff --git a/crates/lumen-core/src/lib.rs b/crates/punktfunk-core/src/lib.rs
similarity index 87%
rename from crates/lumen-core/src/lib.rs
rename to crates/punktfunk-core/src/lib.rs
index 2ba9240d..090b3519 100644
--- a/crates/lumen-core/src/lib.rs
+++ b/crates/punktfunk-core/src/lib.rs
@@ -1,6 +1,6 @@
-//! # lumen-core
+//! # punktfunk-core
 //!
-//! The shared protocol / transport / FEC core for the lumen low-latency streaming
+//! The shared protocol / transport / FEC core for the punktfunk low-latency streaming
 //! stack. It is compiled exactly once and linked by every host and client — directly
 //! as a Rust `lib`, or across the [C ABI](crate::abi) by Swift / Kotlin / C clients.
 //!
@@ -15,7 +15,7 @@
 //! - [`session`] — the host (submit frame → FEC → packetize → seal → send) and client
 //!   (recv → open → reorder → FEC recover → reassemble) state machines.
 //! - [`transport`] — pluggable packet I/O (in-process loopback for tests; UDP for real).
-//! - [`abi`] — the `extern "C"` surface and `cbindgen`-generated `lumen_core.h`.
+//! - [`abi`] — the `extern "C"` surface and `cbindgen`-generated `punktfunk_core.h`.
 //!
 //! ## Threading contract
 //!
@@ -40,10 +40,10 @@ pub mod stats;
 pub mod transport;
 
 pub use config::{Config, FecConfig, FecScheme, Mode, ProtocolPhase, Role};
-pub use error::{LumenError, LumenStatus, Result};
+pub use error::{PunktfunkError, PunktfunkStatus, Result};
 pub use session::{Frame, Session};
 pub use stats::Stats;
 
 /// Bump on any breaking change to the [C ABI](crate::abi). Mirrors
-/// `lumen_abi_version()` and is checked by clients before use.
+/// `punktfunk_abi_version()` and is checked by clients before use.
 pub const ABI_VERSION: u32 = 1;
diff --git a/crates/lumen-core/src/packet.rs b/crates/punktfunk-core/src/packet.rs
similarity index 97%
rename from crates/lumen-core/src/packet.rs
rename to crates/punktfunk-core/src/packet.rs
index 0bad48aa..8d5b5b83 100644
--- a/crates/lumen-core/src/packet.rs
+++ b/crates/punktfunk-core/src/packet.rs
@@ -4,7 +4,7 @@
 //! ## Wire layout
 //!
 //! Each packet is a fixed [`PacketHeader`] followed by one FEC shard's payload. Fields
-//! are host-endian for now (every target platform is little-endian); the `lumen/1` (P2)
+//! are host-endian for now (every target platform is little-endian); the `punktfunk/1` (P2)
 //! spec will pin byte order explicitly when we talk to non-LE peers.
 //!
 //! ## GameStream mapping (P1)
@@ -16,15 +16,15 @@
 //! concern (it also needs RTP framing + RTSP), this is the coherent internal format.
 
 use crate::config::Config;
-use crate::error::{LumenError, Result};
+use crate::error::{PunktfunkError, Result};
 use crate::fec::ErasureCoder;
 use crate::session::Frame;
 use crate::stats::StatsCounters;
 use std::collections::{BTreeMap, HashMap, HashSet};
 use zerocopy::{FromBytes, Immutable, IntoBytes, KnownLayout};
 
-/// Identifies a lumen video packet (vs. an input datagram, see [`crate::input`]).
-pub const LUMEN_MAGIC: u8 = 0xC9;
+/// Identifies a punktfunk video packet (vs. an input datagram, see [`crate::input`]).
+pub const PUNKTFUNK_MAGIC: u8 = 0xC9;
 
 // Frame flags (mirroring GameStream's FLAG_*).
 pub const FLAG_PIC: u8 = 0x1;
@@ -114,10 +114,10 @@ impl Packetizer {
         // already rejects configs that could reach these for valid frame sizes; this is
         // the belt-and-suspenders for a frame larger than the negotiated maximum.
         if payload > u16::MAX as usize {
-            return Err(LumenError::InvalidArg("shard_payload exceeds u16"));
+            return Err(PunktfunkError::InvalidArg("shard_payload exceeds u16"));
         }
         if block_count > u16::MAX as usize {
-            return Err(LumenError::Unsupported(
+            return Err(PunktfunkError::Unsupported(
                 "frame too large: block count exceeds u16",
             ));
         }
@@ -144,7 +144,7 @@ impl Packetizer {
             let recovery = coder.encode(&data_shards, recovery_count)?;
             let total_shards = block_data_count + recovery_count;
             if total_shards > u16::MAX as usize {
-                return Err(LumenError::Unsupported("block shard count exceeds u16"));
+                return Err(PunktfunkError::Unsupported("block shard count exceeds u16"));
             }
 
             for shard_index in 0..total_shards {
@@ -177,7 +177,7 @@ impl Packetizer {
                     recovery_shards: recovery_count as u16,
                     shard_index: shard_index as u16,
                     shard_bytes: payload as u16,
-                    magic: LUMEN_MAGIC,
+                    magic: PUNKTFUNK_MAGIC,
                     version: self.version,
                     fec_scheme: coder.scheme() as u8,
                     flags,
@@ -309,7 +309,7 @@ impl Reassembler {
         let drop = |stats: &StatsCounters| {
             StatsCounters::add(&stats.packets_dropped, 1);
         };
-        if hdr.magic != LUMEN_MAGIC
+        if hdr.magic != PUNKTFUNK_MAGIC
             || shard_bytes != lim.shard_bytes
             || pkt.len() < HEADER_LEN + shard_bytes
             || data_shards == 0
@@ -493,7 +493,7 @@ mod tests {
             recovery_shards: 0,
             shard_index: 0,
             shard_bytes: 16,
-            magic: LUMEN_MAGIC,
+            magic: PUNKTFUNK_MAGIC,
             version: 1,
             fec_scheme: 0,
             flags: FLAG_PIC,
diff --git a/crates/lumen-core/src/quic.rs b/crates/punktfunk-core/src/quic.rs
similarity index 96%
rename from crates/lumen-core/src/quic.rs
rename to crates/punktfunk-core/src/quic.rs
index e3df3678..0c90f05a 100644
--- a/crates/lumen-core/src/quic.rs
+++ b/crates/punktfunk-core/src/quic.rs
@@ -1,6 +1,6 @@
-//! `lumen/1` — the native control plane (M3), gated behind the `quic` feature.
+//! `punktfunk/1` — the native control plane (M3), gated behind the `quic` feature.
 //!
-//! GameStream is lumen's compatibility layer; this is the start of its own protocol. A QUIC
+//! GameStream is punktfunk's compatibility layer; this is the start of its own protocol. A QUIC
 //! connection (quinn, tokio — control plane only, never the per-frame path) carries a
 //! length-prefixed binary handshake on one bidirectional stream:
 //!
@@ -23,10 +23,10 @@
 //! All integers little-endian; every message is `u16 length || payload`.
 
 use crate::config::{Config, FecConfig, FecScheme, Mode, ProtocolPhase, Role};
-use crate::error::{LumenError, Result};
+use crate::error::{PunktfunkError, Result};
 
 /// Protocol magic + version, first bytes of every message payload.
-pub const MAGIC: &[u8; 4] = b"LMN1";
+pub const MAGIC: &[u8; 4] = b"PKF1";
 
 /// `client → host`: open the session, requesting a display mode (the host creates its
 /// virtual output at exactly this size/refresh — native resolution end to end).
@@ -71,7 +71,7 @@ impl Hello {
 
     pub fn decode(b: &[u8]) -> Result<Hello> {
         if b.len() < 20 || &b[0..4] != MAGIC {
-            return Err(LumenError::InvalidArg("bad Hello"));
+            return Err(PunktfunkError::InvalidArg("bad Hello"));
         }
         let u32at = |o: usize| u32::from_le_bytes([b[o], b[o + 1], b[o + 2], b[o + 3]]);
         Ok(Hello {
@@ -113,7 +113,7 @@ impl Welcome {
         // scheme[22] pct[23] max_data[24..26] shard[26..28] encrypt[28] key[29..45]
         // salt[45..49] frames[49..53].
         if b.len() < 53 || &b[0..4] != MAGIC {
-            return Err(LumenError::InvalidArg("bad Welcome"));
+            return Err(PunktfunkError::InvalidArg("bad Welcome"));
         }
         let u32at = |o: usize| u32::from_le_bytes([b[o], b[o + 1], b[o + 2], b[o + 3]]);
         let u16at = |o: usize| u16::from_le_bytes([b[o], b[o + 1]]);
@@ -169,7 +169,7 @@ impl Start {
 
     pub fn decode(b: &[u8]) -> Result<Start> {
         if b.len() < 6 || &b[0..4] != MAGIC {
-            return Err(LumenError::InvalidArg("bad Start"));
+            return Err(PunktfunkError::InvalidArg("bad Start"));
         }
         Ok(Start {
             client_udp_port: u16::from_le_bytes([b[4], b[5]]),
@@ -265,7 +265,7 @@ pub mod endpoint {
     /// Server endpoint with a fresh self-signed certificate (tests/dev — production hosts
     /// persist an identity and use [`server_with_identity`] so clients can pin it).
     pub fn server(addr: std::net::SocketAddr) -> anyhow_result::Result<quinn::Endpoint> {
-        let cert = rcgen::generate_simple_self_signed(vec!["lumen".into()])
+        let cert = rcgen::generate_simple_self_signed(vec!["punktfunk".into()])
             .map_err(|e| anyhow_result::Error::msg(format!("self-signed cert: {e}")))?;
         let cert_der = rustls::pki_types::CertificateDer::from(cert.cert);
         let key_der = rustls::pki_types::PrivatePkcs8KeyDer::from(cert.key_pair.serialize_der());
@@ -351,7 +351,7 @@ pub mod endpoint {
         (ep, observed)
     }
 
-    /// Minimal error plumbing without pulling anyhow into lumen-core's public API.
+    /// Minimal error plumbing without pulling anyhow into punktfunk-core's public API.
     pub mod anyhow_result {
         pub type Result<T> = std::result::Result<T, Error>;
         #[derive(Debug)]
diff --git a/crates/lumen-core/src/session.rs b/crates/punktfunk-core/src/session.rs
similarity index 93%
rename from crates/lumen-core/src/session.rs
rename to crates/punktfunk-core/src/session.rs
index ab4bb978..e26a8d0d 100644
--- a/crates/lumen-core/src/session.rs
+++ b/crates/punktfunk-core/src/session.rs
@@ -10,7 +10,7 @@
 
 use crate::config::{Config, Role};
 use crate::crypto::SessionCrypto;
-use crate::error::{LumenError, Result};
+use crate::error::{PunktfunkError, Result};
 use crate::fec::{coder_for, ErasureCoder};
 use crate::input::InputEvent;
 use crate::packet::{Packetizer, Reassembler, ReassemblerLimits};
@@ -26,7 +26,7 @@ pub struct Frame {
 }
 
 /// One end of a stream. Constructed for a single [`Role`]; calling the other role's
-/// methods returns [`LumenError::InvalidArg`].
+/// methods returns [`PunktfunkError::InvalidArg`].
 ///
 /// Note: the AEAD layer authenticates each datagram but does **not** provide anti-replay.
 /// Video replays are largely absorbed by the reassembler's per-frame dedup, but replayed
@@ -96,7 +96,7 @@ impl Session {
         match &self.crypto {
             Some(c) => {
                 if wire.len() < 8 {
-                    return Err(LumenError::BadPacket);
+                    return Err(PunktfunkError::BadPacket);
                 }
                 let seq = u64::from_be_bytes(wire[..8].try_into().unwrap());
                 c.open(seq, &wire[8..])
@@ -110,7 +110,7 @@ impl Session {
     /// Host: FEC-protect, packetize, seal, and send one encoded access unit.
     pub fn submit_frame(&mut self, data: &[u8], pts_ns: u64, user_flags: u32) -> Result<()> {
         if self.config.role != Role::Host {
-            return Err(LumenError::InvalidArg(
+            return Err(PunktfunkError::InvalidArg(
                 "submit_frame called on a client session",
             ));
         }
@@ -130,7 +130,7 @@ impl Session {
     /// Host: drain one pending input event from the client, if any.
     pub fn poll_input(&mut self) -> Result<Option<InputEvent>> {
         if self.config.role != Role::Host {
-            return Err(LumenError::InvalidArg(
+            return Err(PunktfunkError::InvalidArg(
                 "poll_input called on a client session",
             ));
         }
@@ -151,17 +151,17 @@ impl Session {
     // -- Client path ------------------------------------------------------
 
     /// Client: drain the transport until a whole access unit is recovered, or no more
-    /// packets are pending ([`LumenError::NoFrame`]).
+    /// packets are pending ([`PunktfunkError::NoFrame`]).
     pub fn poll_frame(&mut self) -> Result<Frame> {
         if self.config.role != Role::Client {
-            return Err(LumenError::InvalidArg(
+            return Err(PunktfunkError::InvalidArg(
                 "poll_frame called on a host session",
             ));
         }
         loop {
             let wire = match self.transport.recv()? {
                 Some(w) => w,
-                None => return Err(LumenError::NoFrame),
+                None => return Err(PunktfunkError::NoFrame),
             };
             let pkt = match self.open_from_wire(&wire) {
                 Ok(p) => p,
@@ -184,7 +184,7 @@ impl Session {
     /// Client: serialize and send one input event to the host.
     pub fn send_input(&mut self, event: &InputEvent) -> Result<()> {
         if self.config.role != Role::Client {
-            return Err(LumenError::InvalidArg(
+            return Err(PunktfunkError::InvalidArg(
                 "send_input called on a host session",
             ));
         }
diff --git a/crates/lumen-core/src/stats.rs b/crates/punktfunk-core/src/stats.rs
similarity index 96%
rename from crates/lumen-core/src/stats.rs
rename to crates/punktfunk-core/src/stats.rs
index 5b6974bb..74a798cd 100644
--- a/crates/lumen-core/src/stats.rs
+++ b/crates/punktfunk-core/src/stats.rs
@@ -2,7 +2,7 @@
 
 use std::sync::atomic::{AtomicU64, Ordering};
 
-/// Immutable snapshot, copied across the C ABI as `LumenStats`.
+/// Immutable snapshot, copied across the C ABI as `PunktfunkStats`.
 #[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
 pub struct Stats {
     pub frames_submitted: u64,
diff --git a/crates/lumen-core/src/transport/loopback.rs b/crates/punktfunk-core/src/transport/loopback.rs
similarity index 100%
rename from crates/lumen-core/src/transport/loopback.rs
rename to crates/punktfunk-core/src/transport/loopback.rs
diff --git a/crates/lumen-core/src/transport/mod.rs b/crates/punktfunk-core/src/transport/mod.rs
similarity index 100%
rename from crates/lumen-core/src/transport/mod.rs
rename to crates/punktfunk-core/src/transport/mod.rs
diff --git a/crates/lumen-core/src/transport/udp.rs b/crates/punktfunk-core/src/transport/udp.rs
similarity index 100%
rename from crates/lumen-core/src/transport/udp.rs
rename to crates/punktfunk-core/src/transport/udp.rs
diff --git a/crates/lumen-core/tests/c/harness.c b/crates/punktfunk-core/tests/c/harness.c
similarity index 73%
rename from crates/lumen-core/tests/c/harness.c
rename to crates/punktfunk-core/tests/c/harness.c
index c6e8c24b..37e0476b 100644
--- a/crates/lumen-core/tests/c/harness.c
+++ b/crates/punktfunk-core/tests/c/harness.c
@@ -1,5 +1,5 @@
 /*
- * lumen-core C ABI harness — M1 acceptance.
+ * punktfunk-core C ABI harness — M1 acceptance.
  *
  * Proves the core links from C and round-trips encoded access units through the full
  * packetize -> FEC -> in-process loopback (with deterministic packet loss) -> FEC
@@ -7,16 +7,16 @@
  *
  * Build/run: see tests/c/run.sh (also driven by `cargo test --test c_abi`).
  */
-#include "lumen_core.h"
+#include "punktfunk_core.h"
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-static LumenConfig make_config(uint32_t role, uint32_t drop_period) {
-    LumenConfig c;
+static PunktfunkConfig make_config(uint32_t role, uint32_t drop_period) {
+    PunktfunkConfig c;
     memset(&c, 0, sizeof(c));
-    c.struct_size = (uint32_t)sizeof(LumenConfig);
+    c.struct_size = (uint32_t)sizeof(PunktfunkConfig);
     c.role = role;                 /* 0 = host, 1 = client */
     c.phase = 1;                   /* P1, GameStream-compatible */
     c.fec_scheme = 0;              /* GF(2^8) */
@@ -30,16 +30,16 @@ static LumenConfig make_config(uint32_t role, uint32_t drop_period) {
 }
 
 int main(void) {
-    printf("lumen-core C ABI harness (abi_version=%u)\n", lumen_abi_version());
+    printf("punktfunk-core C ABI harness (abi_version=%u)\n", punktfunk_abi_version());
 
     const uint32_t DROP_PERIOD = 8;   /* drop 1 of every 8 packets */
-    LumenConfig host_cfg = make_config(0, DROP_PERIOD);
-    LumenConfig client_cfg = make_config(1, DROP_PERIOD);
+    PunktfunkConfig host_cfg = make_config(0, DROP_PERIOD);
+    PunktfunkConfig client_cfg = make_config(1, DROP_PERIOD);
 
-    LumenSession *host = NULL;
-    LumenSession *client = NULL;
-    LumenStatus rc = lumen_test_loopback_pair(&host_cfg, &client_cfg, &host, &client);
-    if (rc != LUMEN_STATUS_OK || !host || !client) {
+    PunktfunkSession *host = NULL;
+    PunktfunkSession *client = NULL;
+    PunktfunkStatus rc = punktfunk_test_loopback_pair(&host_cfg, &client_cfg, &host, &client);
+    if (rc != PUNKTFUNK_STATUS_OK || !host || !client) {
         fprintf(stderr, "FAIL: loopback_pair rc=%d\n", (int)rc);
         return 1;
     }
@@ -55,17 +55,17 @@ int main(void) {
             buf[i] = (uint8_t)((i * 131u) + (unsigned)f * 17u);
         }
 
-        rc = lumen_host_submit_frame(host, buf, FRAME_LEN, (uint64_t)f * 1000000u, 0);
-        if (rc != LUMEN_STATUS_OK) {
+        rc = punktfunk_host_submit_frame(host, buf, FRAME_LEN, (uint64_t)f * 1000000u, 0);
+        if (rc != PUNKTFUNK_STATUS_OK) {
             fprintf(stderr, "FAIL: submit frame %d rc=%d\n", f, (int)rc);
             failures++;
             continue;
         }
 
-        LumenFrame out;
+        PunktfunkFrame out;
         memset(&out, 0, sizeof(out));
-        rc = lumen_client_poll_frame(client, &out);
-        if (rc != LUMEN_STATUS_OK) {
+        rc = punktfunk_client_poll_frame(client, &out);
+        if (rc != PUNKTFUNK_STATUS_OK) {
             fprintf(stderr, "FAIL: poll frame %d rc=%d (expected recovery)\n", f, (int)rc);
             failures++;
             continue;
@@ -82,9 +82,9 @@ int main(void) {
         }
     }
 
-    LumenStats st;
+    PunktfunkStats st;
     memset(&st, 0, sizeof(st));
-    lumen_get_stats(client, &st);
+    punktfunk_get_stats(client, &st);
     printf("client stats: completed=%llu recovered_shards=%llu dropped_pkts=%llu rx_pkts=%llu\n",
            (unsigned long long)st.frames_completed,
            (unsigned long long)st.fec_recovered_shards,
@@ -97,8 +97,8 @@ int main(void) {
     }
 
     free(buf);
-    lumen_session_free(host);
-    lumen_session_free(client);
+    punktfunk_session_free(host);
+    punktfunk_session_free(client);
 
     if (failures == 0) {
         printf("PASS: %d frames round-tripped byte-exact through lossy loopback\n", FRAMES);
diff --git a/crates/lumen-core/tests/c/run.sh b/crates/punktfunk-core/tests/c/run.sh
similarity index 57%
rename from crates/lumen-core/tests/c/run.sh
rename to crates/punktfunk-core/tests/c/run.sh
index 1bfb0e7a..dd0b368e 100755
--- a/crates/lumen-core/tests/c/run.sh
+++ b/crates/punktfunk-core/tests/c/run.sh
@@ -1,30 +1,30 @@
 #!/usr/bin/env bash
-# Build lumen-core's staticlib, then compile + link + run the C ABI harness against it.
+# Build punktfunk-core's staticlib, then compile + link + run the C ABI harness against it.
 # Proves the core links from C. Works on Linux and macOS (link flags come from rustc).
 set -euo pipefail
 
 here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-ws="$(cd "$here/../../../.." && pwd)"   # tests/c -> crates/lumen-core -> crates -> ws
+ws="$(cd "$here/../../../.." && pwd)"   # tests/c -> crates/punktfunk-core -> crates -> ws
 cd "$ws"
 
 profile="${1:-debug}"
 build_flag=""
 [ "$profile" = "release" ] && build_flag="--release"
 
-echo ">> building lumen-core staticlib ($profile)"
-cargo build -p lumen-core $build_flag >/dev/null
+echo ">> building punktfunk-core staticlib ($profile)"
+cargo build -p punktfunk-core $build_flag >/dev/null
 
-staticlib="$ws/target/$profile/liblumen_core.a"
+staticlib="$ws/target/$profile/libpunktfunk_core.a"
 header_dir="$ws/include"
 [ -f "$staticlib" ] || { echo "missing $staticlib"; exit 1; }
-[ -f "$header_dir/lumen_core.h" ] || { echo "missing generated header"; exit 1; }
+[ -f "$header_dir/punktfunk_core.h" ] || { echo "missing generated header"; exit 1; }
 
 # Ask rustc what native libs the staticlib needs to link into a C program.
-native_libs="$(cargo rustc -p lumen-core --lib --crate-type staticlib $build_flag -- \
+native_libs="$(cargo rustc -p punktfunk-core --lib --crate-type staticlib $build_flag -- \
     --print native-static-libs 2>&1 | sed -n 's/.*native-static-libs: //p' | tail -1)"
 echo ">> native libs: ${native_libs:-<none>}"
 
-out="$(mktemp -d)/lumen_harness"
+out="$(mktemp -d)/punktfunk_harness"
 cc="${CC:-cc}"
 echo ">> compiling + linking harness"
 $cc -std=c11 -Wall -Wextra -O2 -I "$header_dir" \
diff --git a/crates/lumen-core/tests/c_abi.rs b/crates/punktfunk-core/tests/c_abi.rs
similarity index 84%
rename from crates/lumen-core/tests/c_abi.rs
rename to crates/punktfunk-core/tests/c_abi.rs
index da3a06cb..b35f353d 100644
--- a/crates/lumen-core/tests/c_abi.rs
+++ b/crates/punktfunk-core/tests/c_abi.rs
@@ -1,5 +1,5 @@
 //! Runs the C ABI harness under `cargo test`: compiles `tests/c/harness.c`, links it
-//! against the freshly built `liblumen_core.a`, and asserts it round-trips frames
+//! against the freshly built `libpunktfunk_core.a`, and asserts it round-trips frames
 //! through the lossy loopback. The cross-platform canonical path (querying rustc for
 //! link flags) is `tests/c/run.sh`; this mirrors it so `cargo test` alone covers the
 //! C boundary.
@@ -21,13 +21,13 @@ fn native_libs() -> &'static [&'static str] {
 }
 
 fn ensure_staticlib(profile_dir: &Path) -> PathBuf {
-    let staticlib = profile_dir.join("liblumen_core.a");
+    let staticlib = profile_dir.join("libpunktfunk_core.a");
     if !staticlib.exists() {
         // `cargo test` doesn't always emit the standalone staticlib; build it. The
         // outer cargo's build lock is released during test execution, so this is safe.
         let cargo = std::env::var("CARGO").unwrap_or_else(|_| "cargo".into());
         let _ = Command::new(cargo)
-            .args(["build", "-p", "lumen-core"])
+            .args(["build", "-p", "punktfunk-core"])
             .status();
     }
     staticlib
@@ -35,7 +35,7 @@ fn ensure_staticlib(profile_dir: &Path) -> PathBuf {
 
 #[test]
 fn c_abi_harness_round_trips() {
-    let manifest = PathBuf::from(env!("CARGO_MANIFEST_DIR")); // crates/lumen-core
+    let manifest = PathBuf::from(env!("CARGO_MANIFEST_DIR")); // crates/punktfunk-core
     let harness = manifest.join("tests/c/harness.c");
     let include = manifest.join("../../include");
 
@@ -50,16 +50,16 @@ fn c_abi_harness_round_trips() {
     let staticlib = ensure_staticlib(&profile_dir);
     assert!(
         staticlib.exists(),
-        "staticlib not found at {} (run `cargo build -p lumen-core`)",
+        "staticlib not found at {} (run `cargo build -p punktfunk-core`)",
         staticlib.display()
     );
     assert!(
-        include.join("lumen_core.h").exists(),
-        "generated header missing; build lumen-core to regenerate it"
+        include.join("punktfunk_core.h").exists(),
+        "generated header missing; build punktfunk-core to regenerate it"
     );
 
     let cc = std::env::var("CC").unwrap_or_else(|_| "cc".into());
-    let out = profile_dir.join("lumen_c_harness");
+    let out = profile_dir.join("punktfunk_c_harness");
 
     let mut compile = Command::new(&cc);
     compile
diff --git a/crates/lumen-core/tests/loopback.rs b/crates/punktfunk-core/tests/loopback.rs
similarity index 94%
rename from crates/lumen-core/tests/loopback.rs
rename to crates/punktfunk-core/tests/loopback.rs
index f7a958ff..d4aeb10b 100644
--- a/crates/lumen-core/tests/loopback.rs
+++ b/crates/punktfunk-core/tests/loopback.rs
@@ -3,19 +3,19 @@
 //! byte-exact recovery, for both FEC schemes, with and without encryption. Plus
 //! property tests over the FEC layer's loss patterns.
 
-use lumen_core::config::{Config, FecConfig, FecScheme, ProtocolPhase, Role};
-use lumen_core::fec::coder_for;
-use lumen_core::input::{InputEvent, InputKind};
-use lumen_core::session::Session;
-use lumen_core::transport::loopback_pair;
 use proptest::prelude::*;
+use punktfunk_core::config::{Config, FecConfig, FecScheme, ProtocolPhase, Role};
+use punktfunk_core::fec::coder_for;
+use punktfunk_core::input::{InputEvent, InputKind};
+use punktfunk_core::session::Session;
+use punktfunk_core::transport::loopback_pair;
 
 fn config(role: Role, scheme: FecScheme, encrypt: bool, drop_period: u32) -> Config {
     Config {
         role,
         phase: match scheme {
             FecScheme::Gf8 => ProtocolPhase::P1GameStream,
-            FecScheme::Gf16 => ProtocolPhase::P2Lumen,
+            FecScheme::Gf16 => ProtocolPhase::P2Punktfunk,
         },
         fec: FecConfig {
             scheme,
@@ -38,7 +38,7 @@ fn run_stream(
     encrypt: bool,
     drop_period: u32,
     frames: &[Vec<u8>],
-) -> lumen_core::Stats {
+) -> punktfunk_core::Stats {
     let (host_tp, client_tp) = loopback_pair(drop_period, 0);
     let mut host = Session::new(
         config(Role::Host, scheme, encrypt, drop_period),
diff --git a/crates/lumen-core/vendor/fec-rs/Cargo.toml b/crates/punktfunk-core/vendor/fec-rs/Cargo.toml
similarity index 100%
rename from crates/lumen-core/vendor/fec-rs/Cargo.toml
rename to crates/punktfunk-core/vendor/fec-rs/Cargo.toml
diff --git a/crates/lumen-core/vendor/fec-rs/LICENSE b/crates/punktfunk-core/vendor/fec-rs/LICENSE
similarity index 100%
rename from crates/lumen-core/vendor/fec-rs/LICENSE
rename to crates/punktfunk-core/vendor/fec-rs/LICENSE
diff --git a/crates/lumen-core/vendor/fec-rs/README.md b/crates/punktfunk-core/vendor/fec-rs/README.md
similarity index 100%
rename from crates/lumen-core/vendor/fec-rs/README.md
rename to crates/punktfunk-core/vendor/fec-rs/README.md
diff --git a/crates/lumen-core/vendor/fec-rs/build.rs b/crates/punktfunk-core/vendor/fec-rs/build.rs
similarity index 100%
rename from crates/lumen-core/vendor/fec-rs/build.rs
rename to crates/punktfunk-core/vendor/fec-rs/build.rs
diff --git a/crates/lumen-core/vendor/fec-rs/src/errors.rs b/crates/punktfunk-core/vendor/fec-rs/src/errors.rs
similarity index 100%
rename from crates/lumen-core/vendor/fec-rs/src/errors.rs
rename to crates/punktfunk-core/vendor/fec-rs/src/errors.rs
diff --git a/crates/lumen-core/vendor/fec-rs/src/galois.rs b/crates/punktfunk-core/vendor/fec-rs/src/galois.rs
similarity index 100%
rename from crates/lumen-core/vendor/fec-rs/src/galois.rs
rename to crates/punktfunk-core/vendor/fec-rs/src/galois.rs
diff --git a/crates/lumen-core/vendor/fec-rs/src/lib.rs b/crates/punktfunk-core/vendor/fec-rs/src/lib.rs
similarity index 100%
rename from crates/lumen-core/vendor/fec-rs/src/lib.rs
rename to crates/punktfunk-core/vendor/fec-rs/src/lib.rs
diff --git a/crates/lumen-core/vendor/fec-rs/src/matrix.rs b/crates/punktfunk-core/vendor/fec-rs/src/matrix.rs
similarity index 100%
rename from crates/lumen-core/vendor/fec-rs/src/matrix.rs
rename to crates/punktfunk-core/vendor/fec-rs/src/matrix.rs
diff --git a/crates/lumen-core/vendor/fec-rs/src/reed_solomon.rs b/crates/punktfunk-core/vendor/fec-rs/src/reed_solomon.rs
similarity index 100%
rename from crates/lumen-core/vendor/fec-rs/src/reed_solomon.rs
rename to crates/punktfunk-core/vendor/fec-rs/src/reed_solomon.rs
diff --git a/crates/lumen-host/Cargo.toml b/crates/punktfunk-host/Cargo.toml
similarity index 93%
rename from crates/lumen-host/Cargo.toml
rename to crates/punktfunk-host/Cargo.toml
index 86074138..84bb4857 100644
--- a/crates/lumen-host/Cargo.toml
+++ b/crates/punktfunk-host/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
-name = "lumen-host"
-description = "lumen Linux streaming host: virtual display, capture, encode, input injection"
+name = "punktfunk-host"
+description = "punktfunk Linux streaming host: virtual display, capture, encode, input injection"
 version.workspace = true
 edition.workspace = true
 rust-version.workspace = true
@@ -9,8 +9,8 @@ authors.workspace = true
 repository.workspace = true
 
 [dependencies]
-lumen-core = { path = "../lumen-core", features = ["quic"] }
-# M3 native control plane (the `lumen/1` QUIC handshake; data plane stays native-thread UDP).
+punktfunk-core = { path = "../punktfunk-core", features = ["quic"] }
+# M3 native control plane (the `punktfunk/1` QUIC handshake; data plane stays native-thread UDP).
 quinn = "0.11"
 anyhow = "1"
 tracing = "0.1"
diff --git a/crates/lumen-host/protocols/zkde-screencast-unstable-v1.xml b/crates/punktfunk-host/protocols/zkde-screencast-unstable-v1.xml
similarity index 100%
rename from crates/lumen-host/protocols/zkde-screencast-unstable-v1.xml
rename to crates/punktfunk-host/protocols/zkde-screencast-unstable-v1.xml
diff --git a/crates/lumen-host/src/audio.rs b/crates/punktfunk-host/src/audio.rs
similarity index 100%
rename from crates/lumen-host/src/audio.rs
rename to crates/punktfunk-host/src/audio.rs
diff --git a/crates/lumen-host/src/audio/linux.rs b/crates/punktfunk-host/src/audio/linux.rs
similarity index 98%
rename from crates/lumen-host/src/audio/linux.rs
rename to crates/punktfunk-host/src/audio/linux.rs
index 6de725fb..e908e744 100644
--- a/crates/lumen-host/src/audio/linux.rs
+++ b/crates/punktfunk-host/src/audio/linux.rs
@@ -20,7 +20,7 @@ impl PwAudioCapturer {
     pub fn open() -> Result<PwAudioCapturer> {
         let (tx, rx) = sync_channel::<Vec<f32>>(64);
         thread::Builder::new()
-            .name("lumen-pw-audio".into())
+            .name("punktfunk-pw-audio".into())
             .spawn(move || {
                 if let Err(e) = pw_thread(tx) {
                     tracing::error!(error = %format!("{e:#}"), "pipewire audio thread failed");
@@ -60,7 +60,7 @@ fn pw_thread(tx: std::sync::mpsc::SyncSender<Vec<f32>>) -> Result<()> {
 
     let stream = pw::stream::StreamBox::new(
         &core,
-        "lumen-audio",
+        "punktfunk-audio",
         properties! {
             *pw::keys::MEDIA_TYPE          => "Audio",
             *pw::keys::MEDIA_CATEGORY      => "Capture",
diff --git a/crates/lumen-host/src/capture.rs b/crates/punktfunk-host/src/capture.rs
similarity index 98%
rename from crates/lumen-host/src/capture.rs
rename to crates/punktfunk-host/src/capture.rs
index 185321d4..ed07a580 100644
--- a/crates/lumen-host/src/capture.rs
+++ b/crates/punktfunk-host/src/capture.rs
@@ -90,7 +90,7 @@ pub trait Capturer: Send {
 }
 
 /// A deterministic moving test pattern (BGRx). Lets M0 exercise the encode → file →
-/// `lumen_core` path with no live capture session, and produces obviously non-static
+/// `punktfunk_core` path with no live capture session, and produces obviously non-static
 /// content (a sweeping bar + animated gradient) so the encoded output is verifiable.
 pub struct SyntheticCapturer {
     width: u32,
diff --git a/crates/lumen-host/src/capture/linux.rs b/crates/punktfunk-host/src/capture/linux.rs
similarity index 99%
rename from crates/lumen-host/src/capture/linux.rs
rename to crates/punktfunk-host/src/capture/linux.rs
index 07c4c4a5..9c2ae75f 100644
--- a/crates/lumen-host/src/capture/linux.rs
+++ b/crates/punktfunk-host/src/capture/linux.rs
@@ -45,7 +45,7 @@ impl PortalCapturer {
         // Portal handshake (async) on its own thread; hands back the PW fd + node id.
         let (setup_tx, setup_rx) = std::sync::mpsc::channel::<Result<(OwnedFd, u32), String>>();
         thread::Builder::new()
-            .name("lumen-portal".into())
+            .name("punktfunk-portal".into())
             .spawn(move || {
                 if anchored {
                     portal_thread_remote_desktop(setup_tx)
@@ -105,7 +105,7 @@ fn spawn_pipewire(
     let active_cb = active.clone();
     let zerocopy = crate::zerocopy::enabled();
     thread::Builder::new()
-        .name("lumen-pipewire".into())
+        .name("punktfunk-pipewire".into())
         .spawn(move || {
             if let Err(e) =
                 pipewire::pipewire_thread(fd, node_id, frame_tx, active_cb, zerocopy, preferred)
@@ -652,7 +652,7 @@ mod pipewire {
 
         let stream = pw::stream::StreamBox::new(
             &core,
-            "lumen-screencast",
+            "punktfunk-screencast",
             properties! {
                 *pw::keys::MEDIA_TYPE     => "Video",
                 *pw::keys::MEDIA_CATEGORY => "Capture",
@@ -871,9 +871,9 @@ mod pipewire {
             .register()
             .context("register stream listener")?;
 
-        // Debug knob: offer a single fixed format (LUMEN_PW_FIXED_POD="WxH") to bisect
+        // Debug knob: offer a single fixed format (PUNKTFUNK_PW_FIXED_POD="WxH") to bisect
         // negotiation failures against a producer's exact EnumFormat (e.g. gamescope).
-        let fixed_pod: Option<(u32, u32)> = std::env::var("LUMEN_PW_FIXED_POD")
+        let fixed_pod: Option<(u32, u32)> = std::env::var("PUNKTFUNK_PW_FIXED_POD")
             .ok()
             .and_then(|v| v.split_once('x').map(|(w, h)| (w.parse(), h.parse())))
             .and_then(|(w, h)| Some((w.ok()?, h.ok()?)));
diff --git a/crates/lumen-host/src/encode.rs b/crates/punktfunk-host/src/encode.rs
similarity index 98%
rename from crates/lumen-host/src/encode.rs
rename to crates/punktfunk-host/src/encode.rs
index af3c2e83..8b1015cc 100644
--- a/crates/lumen-host/src/encode.rs
+++ b/crates/punktfunk-host/src/encode.rs
@@ -6,7 +6,7 @@
 use crate::capture::{CapturedFrame, PixelFormat};
 use anyhow::Result;
 
-/// An encoded access unit (one NAL/AU) to hand to `lumen_core` for FEC + packetization.
+/// An encoded access unit (one NAL/AU) to hand to `punktfunk_core` for FEC + packetization.
 /// `data` is in-band Annex-B (the encoder is opened without a global header), so each
 /// keyframe carries its own VPS/SPS/PPS — the bytes are both a playable elementary
 /// stream and a self-contained AU for the wire.
diff --git a/crates/lumen-host/src/encode/linux.rs b/crates/punktfunk-host/src/encode/linux.rs
similarity index 98%
rename from crates/lumen-host/src/encode/linux.rs
rename to crates/punktfunk-host/src/encode/linux.rs
index 564d55f1..384be786 100644
--- a/crates/lumen-host/src/encode/linux.rs
+++ b/crates/punktfunk-host/src/encode/linux.rs
@@ -139,7 +139,7 @@ impl NvencEncoder {
         cuda: bool,
     ) -> Result<Self> {
         ffmpeg::init().context("ffmpeg init")?;
-        if std::env::var_os("LUMEN_FFMPEG_DEBUG").is_some() {
+        if std::env::var_os("PUNKTFUNK_FFMPEG_DEBUG").is_some() {
             unsafe { ffi::av_log_set_level(48) }; // AV_LOG_DEBUG — surface NVENC hw-frame rejects
         }
         let name = codec.nvenc_name();
@@ -198,9 +198,9 @@ impl NvencEncoder {
         // a single engine's HEVC capacity (~1 Gpix/s); e.g. 5120x1440@240 = 1.77 Gpix/s needs it,
         // @120 = 0.88 Gpix/s does not. HEVC/AV1 only (not H.264). AUTO won't engage below ~2112px
         // height, so we force `2`; below the threshold we leave it AUTO (split costs ~2% BD-rate).
-        // Output is standard HEVC — transparent to the client. Override with LUMEN_SPLIT_ENCODE.
+        // Output is standard HEVC — transparent to the client. Override with PUNKTFUNK_SPLIT_ENCODE.
         let pix_rate = width as u64 * height as u64 * fps as u64;
-        let split = std::env::var("LUMEN_SPLIT_ENCODE").ok();
+        let split = std::env::var("PUNKTFUNK_SPLIT_ENCODE").ok();
         match split.as_deref() {
             Some(mode) => opts.set("split_encode_mode", mode),
             None if matches!(codec, Codec::H265 | Codec::Av1) && pix_rate > 1_000_000_000 => {
diff --git a/crates/lumen-host/src/gamestream/apps.rs b/crates/punktfunk-host/src/gamestream/apps.rs
similarity index 97%
rename from crates/lumen-host/src/gamestream/apps.rs
rename to crates/punktfunk-host/src/gamestream/apps.rs
index 1755bdad..7cc6f276 100644
--- a/crates/lumen-host/src/gamestream/apps.rs
+++ b/crates/punktfunk-host/src/gamestream/apps.rs
@@ -1,6 +1,6 @@
 //! The app catalog: what `/applist` advertises and what `/launch?appid=N` selects. Each entry
 //! maps to a session recipe — which compositor backend hosts it and (for gamescope) which
-//! command runs nested. Loaded from `~/.config/lumen/apps.json`; sensible defaults otherwise.
+//! command runs nested. Loaded from `~/.config/punktfunk/apps.json`; sensible defaults otherwise.
 //!
 //! ```json
 //! [ {"id":1,"title":"Desktop"},
@@ -20,7 +20,7 @@ pub struct AppEntry {
 }
 
 fn config_path() -> Option<std::path::PathBuf> {
-    Some(std::path::Path::new(&std::env::var("HOME").ok()?).join(".config/lumen/apps.json"))
+    Some(std::path::Path::new(&std::env::var("HOME").ok()?).join(".config/punktfunk/apps.json"))
 }
 
 fn parse_compositor(s: &str) -> Option<crate::vdisplay::Compositor> {
diff --git a/crates/lumen-host/src/gamestream/audio.rs b/crates/punktfunk-host/src/gamestream/audio.rs
similarity index 97%
rename from crates/lumen-host/src/gamestream/audio.rs
rename to crates/punktfunk-host/src/gamestream/audio.rs
index 27fac9c8..b4085620 100644
--- a/crates/lumen-host/src/gamestream/audio.rs
+++ b/crates/punktfunk-host/src/gamestream/audio.rs
@@ -38,7 +38,7 @@ pub type AudioCapSlot = Arc<std::sync::Mutex<Option<Box<dyn AudioCapturer>>>>;
 /// `gcm_key`/`rikeyid` come from `/launch` and key the AES-CBC payload encryption.
 pub fn start(running: Arc<AtomicBool>, gcm_key: [u8; 16], rikeyid: i32, audio_cap: AudioCapSlot) {
     let _ = std::thread::Builder::new()
-        .name("lumen-audio".into())
+        .name("punktfunk-audio".into())
         .spawn(move || {
             tracing::info!("audio stream starting");
             if let Err(e) = run(&running, &gcm_key, rikeyid, &audio_cap) {
@@ -105,8 +105,8 @@ fn audio_body(
     // each frame at its 5 ms slot instead. Production is real-time, so the backlog stays small.
     let start = Instant::now();
     let mut frame_no: u64 = 0;
-    // Optional linear gain for quiet capture sources (LUMEN_AUDIO_GAIN, default 1.0).
-    let gain: f32 = std::env::var("LUMEN_AUDIO_GAIN")
+    // Optional linear gain for quiet capture sources (PUNKTFUNK_AUDIO_GAIN, default 1.0).
+    let gain: f32 = std::env::var("PUNKTFUNK_AUDIO_GAIN")
         .ok()
         .and_then(|v| v.parse().ok())
         .unwrap_or(1.0);
diff --git a/crates/lumen-host/src/gamestream/cert.rs b/crates/punktfunk-host/src/gamestream/cert.rs
similarity index 97%
rename from crates/lumen-host/src/gamestream/cert.rs
rename to crates/punktfunk-host/src/gamestream/cert.rs
index 7ade3411..94d5a3d8 100644
--- a/crates/lumen-host/src/gamestream/cert.rs
+++ b/crates/punktfunk-host/src/gamestream/cert.rs
@@ -38,7 +38,7 @@ impl ServerIdentity {
                     .with_context(|| format!("write {}", cert_path.display()))?;
                 fs::write(&key_path, &k)
                     .with_context(|| format!("write {}", key_path.display()))?;
-                tracing::info!(path = %cert_path.display(), "generated lumen host certificate (RSA-2048)");
+                tracing::info!(path = %cert_path.display(), "generated punktfunk host certificate (RSA-2048)");
                 (c, k)
             }
         };
@@ -70,7 +70,7 @@ fn generate() -> Result<(String, String)> {
     let mut params = rcgen::CertificateParams::new(Vec::<String>::new()).context("cert params")?;
     params
         .distinguished_name
-        .push(rcgen::DnType::CommonName, "lumen");
+        .push(rcgen::DnType::CommonName, "punktfunk");
     params.not_before = rcgen::date_time_ymd(2020, 1, 1);
     params.not_after = rcgen::date_time_ymd(2040, 1, 1);
     let cert = params.self_signed(&key).context("self-sign cert")?;
diff --git a/crates/lumen-host/src/gamestream/control.rs b/crates/punktfunk-host/src/gamestream/control.rs
similarity index 99%
rename from crates/lumen-host/src/gamestream/control.rs
rename to crates/punktfunk-host/src/gamestream/control.rs
index 489e157c..7214142e 100644
--- a/crates/lumen-host/src/gamestream/control.rs
+++ b/crates/punktfunk-host/src/gamestream/control.rs
@@ -51,7 +51,7 @@ pub fn spawn(state: Arc<AppState>) -> Result<()> {
     tracing::info!(port = CONTROL_PORT, "ENet control listening");
 
     std::thread::Builder::new()
-        .name("lumen-control".into())
+        .name("punktfunk-control".into())
         .spawn(move || {
             // Thread-local (the injector owns non-Send Wayland/xkb state, so it must be
             // created and live here rather than be captured into the closure).
@@ -189,7 +189,7 @@ fn on_receive(
 
     // Open the injector on demand — by the first input event the compositor session is up.
     // Backend auto-selects per desktop (wlr on Sway, libei on KWin/GNOME); override with
-    // LUMEN_INPUT_BACKEND.
+    // PUNKTFUNK_INPUT_BACKEND.
     if injector.is_none() {
         let backend = crate::inject::default_backend();
         match crate::inject::open(backend) {
diff --git a/crates/lumen-host/src/gamestream/crypto.rs b/crates/punktfunk-host/src/gamestream/crypto.rs
similarity index 98%
rename from crates/lumen-host/src/gamestream/crypto.rs
rename to crates/punktfunk-host/src/gamestream/crypto.rs
index 23791f5c..6f91c014 100644
--- a/crates/lumen-host/src/gamestream/crypto.rs
+++ b/crates/punktfunk-host/src/gamestream/crypto.rs
@@ -1,4 +1,4 @@
-//! Pairing crypto primitives (control plane only — distinct from `lumen_core`'s AES-GCM
+//! Pairing crypto primitives (control plane only — distinct from `punktfunk_core`'s AES-GCM
 //! data-plane sealing). GameStream pairing uses: AES-128-**ECB** with **no padding**,
 //! SHA-256 (host appversion major ≥ 7), and RSA-PKCS1v15-SHA256 signatures. See the
 //! `serverinfo + pairing` section of `docs/research/gamestream-protocol-research.json`.
diff --git a/crates/lumen-host/src/gamestream/gamepad.rs b/crates/punktfunk-host/src/gamestream/gamepad.rs
similarity index 100%
rename from crates/lumen-host/src/gamestream/gamepad.rs
rename to crates/punktfunk-host/src/gamestream/gamepad.rs
diff --git a/crates/lumen-host/src/gamestream/input.rs b/crates/punktfunk-host/src/gamestream/input.rs
similarity index 98%
rename from crates/lumen-host/src/gamestream/input.rs
rename to crates/punktfunk-host/src/gamestream/input.rs
index 83470c01..0e554cd9 100644
--- a/crates/lumen-host/src/gamestream/input.rs
+++ b/crates/punktfunk-host/src/gamestream/input.rs
@@ -1,6 +1,6 @@
 //! Decode the GameStream input wire format (carried AES-GCM-encrypted on the ENet control
 //! stream — see [`super::control`]) into platform-agnostic
-//! [`lumen_core::input::InputEvent`]s for injection.
+//! [`punktfunk_core::input::InputEvent`]s for injection.
 //!
 //! A decrypted control message is `[u16 type LE][u16 length LE][NV_INPUT packet]`. We only
 //! handle the input type (`0x0206`); the packet is an 8-byte `NV_INPUT_HEADER` (`size` BE,
@@ -9,7 +9,7 @@
 //! mirror moonlight-common-c `Input.h`; the magic dispatch matches Sunshine `input.cpp`
 //! (Gen5+, where scroll is `0x0A` and controllers are `0x0C`, so there's no ambiguity).
 
-use lumen_core::input::{InputEvent, InputKind};
+use punktfunk_core::input::{InputEvent, InputKind};
 
 /// Inner control-message type for input (moonlight `packetTypesGen7[IDX_INPUT_DATA]`).
 const INPUT_DATA_TYPE: u16 = 0x0206;
diff --git a/crates/lumen-host/src/gamestream/mdns.rs b/crates/punktfunk-host/src/gamestream/mdns.rs
similarity index 100%
rename from crates/lumen-host/src/gamestream/mdns.rs
rename to crates/punktfunk-host/src/gamestream/mdns.rs
diff --git a/crates/lumen-host/src/gamestream/mod.rs b/crates/punktfunk-host/src/gamestream/mod.rs
similarity index 96%
rename from crates/lumen-host/src/gamestream/mod.rs
rename to crates/punktfunk-host/src/gamestream/mod.rs
index b630bdfe..3094b59b 100644
--- a/crates/lumen-host/src/gamestream/mod.rs
+++ b/crates/punktfunk-host/src/gamestream/mod.rs
@@ -1,7 +1,7 @@
 //! GameStream (P1) control plane — what a stock Moonlight/Artemis client talks to around
 //! the media streams: mDNS discovery, the nvhttp serverinfo + pairing HTTP(S) API, RTSP,
 //! and the ENet control stream. `tokio`/`axum` live here (control plane, I/O-bound — never
-//! the per-frame hot path; that is `lumen_core`'s P1 wire codec). See `docs/m2-plan.md`.
+//! the per-frame hot path; that is `punktfunk_core`'s P1 wire codec). See `docs/m2-plan.md`.
 //!
 //! Status: P1.1 — mDNS `_nvstream._tcp` advertisement + `/serverinfo`. Pairing, RTSP, and
 //! the media streams follow (see the M2 task list / plan).
@@ -154,7 +154,7 @@ pub fn serve(mgmt: crate::mgmt::Options) -> Result<()> {
         hostname = %state.host.hostname,
         uniqueid = %state.host.uniqueid,
         ip = %state.host.local_ip,
-        "lumen GameStream host (P1.1: serverinfo + pairing + mDNS)"
+        "punktfunk GameStream host (P1.1: serverinfo + pairing + mDNS)"
     );
     let rt = tokio::runtime::Runtime::new().context("build tokio runtime")?;
     rt.block_on(async move {
@@ -168,13 +168,13 @@ pub fn serve(mgmt: crate::mgmt::Options) -> Result<()> {
     })
 }
 
-/// `~/.config/lumen`, created on demand — host identity + (later) pairing state live here.
+/// `~/.config/punktfunk`, created on demand — host identity + (later) pairing state live here.
 fn config_dir() -> PathBuf {
     let base = std::env::var_os("XDG_CONFIG_HOME")
         .map(PathBuf::from)
         .or_else(|| std::env::var_os("HOME").map(|h| PathBuf::from(h).join(".config")))
         .unwrap_or_else(|| PathBuf::from("."));
-    base.join("lumen")
+    base.join("punktfunk")
 }
 
 fn hostname_string() -> String {
@@ -182,7 +182,7 @@ fn hostname_string() -> String {
         .ok()
         .map(|s| s.trim().to_string())
         .filter(|s| !s.is_empty())
-        .unwrap_or_else(|| "lumen-host".to_string())
+        .unwrap_or_else(|| "punktfunk-host".to_string())
 }
 
 /// Load the persisted host uniqueid, or mint one (from the kernel UUID source) and store it.
@@ -212,7 +212,7 @@ fn primary_local_ip() -> Option<IpAddr> {
 
 /// Where the paired-client allow-list persists (survives host restarts, like Sunshine).
 fn paired_path() -> Option<std::path::PathBuf> {
-    Some(std::path::Path::new(&std::env::var("HOME").ok()?).join(".config/lumen/paired.json"))
+    Some(std::path::Path::new(&std::env::var("HOME").ok()?).join(".config/punktfunk/paired.json"))
 }
 
 /// Load the persisted paired-client certificate DERs (empty on first run / parse failure).
diff --git a/crates/lumen-host/src/gamestream/nvhttp.rs b/crates/punktfunk-host/src/gamestream/nvhttp.rs
similarity index 99%
rename from crates/lumen-host/src/gamestream/nvhttp.rs
rename to crates/punktfunk-host/src/gamestream/nvhttp.rs
index 72b39790..f1729986 100644
--- a/crates/lumen-host/src/gamestream/nvhttp.rs
+++ b/crates/punktfunk-host/src/gamestream/nvhttp.rs
@@ -1,5 +1,5 @@
 //! The nvhttp servers: plain HTTP on 47989 and mutual-TLS on 47984. Serves `/serverinfo`,
-//! the `/pair` flow, `/applist`, and `/launch`/`/resume`/`/cancel`, plus a lumen-only
+//! the `/pair` flow, `/applist`, and `/launch`/`/resume`/`/cancel`, plus a punktfunk-only
 //! `/pin` endpoint to deliver the Moonlight-displayed PIN. Over HTTPS the client is
 //! mutual-TLS-authenticated, so `/serverinfo` reports `PairStatus=1` there.
 
diff --git a/crates/lumen-host/src/gamestream/pairing.rs b/crates/punktfunk-host/src/gamestream/pairing.rs
similarity index 100%
rename from crates/lumen-host/src/gamestream/pairing.rs
rename to crates/punktfunk-host/src/gamestream/pairing.rs
diff --git a/crates/lumen-host/src/gamestream/rtsp.rs b/crates/punktfunk-host/src/gamestream/rtsp.rs
similarity index 99%
rename from crates/lumen-host/src/gamestream/rtsp.rs
rename to crates/punktfunk-host/src/gamestream/rtsp.rs
index 65f2e467..8808c4f1 100644
--- a/crates/lumen-host/src/gamestream/rtsp.rs
+++ b/crates/punktfunk-host/src/gamestream/rtsp.rs
@@ -27,7 +27,7 @@ pub fn spawn(state: Arc<AppState>) -> Result<()> {
         .with_context(|| format!("bind RTSP {RTSP_PORT}"))?;
     tracing::info!(port = RTSP_PORT, "RTSP listening");
     std::thread::Builder::new()
-        .name("lumen-rtsp".into())
+        .name("punktfunk-rtsp".into())
         .spawn(move || {
             for conn in listener.incoming() {
                 match conn {
diff --git a/crates/lumen-host/src/gamestream/serverinfo.rs b/crates/punktfunk-host/src/gamestream/serverinfo.rs
similarity index 100%
rename from crates/lumen-host/src/gamestream/serverinfo.rs
rename to crates/punktfunk-host/src/gamestream/serverinfo.rs
diff --git a/crates/lumen-host/src/gamestream/stream.rs b/crates/punktfunk-host/src/gamestream/stream.rs
similarity index 96%
rename from crates/lumen-host/src/gamestream/stream.rs
rename to crates/punktfunk-host/src/gamestream/stream.rs
index 239f0225..9b039b95 100644
--- a/crates/lumen-host/src/gamestream/stream.rs
+++ b/crates/punktfunk-host/src/gamestream/stream.rs
@@ -1,6 +1,6 @@
 //! The video data plane: on RTSP PLAY, learn the client's UDP endpoint (it pings the video
 //! port), then run capture → NVENC encode → [`VideoPacketizer`] → UDP send. The source is
-//! either real portal desktop capture (`LUMEN_VIDEO_SOURCE=portal`, the M0 PipeWire path) or
+//! either real portal desktop capture (`PUNKTFUNK_VIDEO_SOURCE=portal`, the M0 PipeWire path) or
 //! a synthetic test pattern (default). Runs on its own native thread.
 
 use super::video::{FrameType, VideoPacketizer};
@@ -42,7 +42,7 @@ pub fn start(
     video_cap: CapturerSlot,
 ) {
     let _ = std::thread::Builder::new()
-        .name("lumen-video".into())
+        .name("punktfunk-video".into())
         .spawn(move || {
             tracing::info!(?cfg, "video stream starting");
             if let Err(e) = run(cfg, app.as_ref(), &running, &force_idr, &video_cap) {
@@ -83,7 +83,7 @@ fn run(
     // request and capture it (no scaling). Self-contained — deliberately NOT pooled in
     // `video_cap`, since a reconnect at a different resolution needs a freshly-sized output; the
     // output is released when this capturer drops at stream end (RAII via its keepalive).
-    if std::env::var("LUMEN_VIDEO_SOURCE").as_deref() == Ok("virtual") {
+    if std::env::var("PUNKTFUNK_VIDEO_SOURCE").as_deref() == Ok("virtual") {
         // The launched app picks the compositor (e.g. gamescope for game entries) and the
         // nested command; env vars remain manual overrides / fallbacks.
         let compositor = app
@@ -93,7 +93,7 @@ fn run(
         if let Some(cmd) = app.and_then(|a| a.cmd.as_deref()) {
             // The gamescope backend reads the nested command from this env var; setting it
             // per-launch is safe (one stream session at a time).
-            std::env::set_var("LUMEN_GAMESCOPE_APP", cmd);
+            std::env::set_var("PUNKTFUNK_GAMESCOPE_APP", cmd);
         }
         tracing::info!(
             ?compositor,
@@ -104,7 +104,7 @@ fn run(
         );
         let mut vd = crate::vdisplay::open(compositor).context("open virtual display")?;
         let vout = vd
-            .create(lumen_core::Mode {
+            .create(punktfunk_core::Mode {
                 width: cfg.width,
                 height: cfg.height,
                 refresh_hz: cfg.fps,
@@ -123,7 +123,7 @@ fn run(
             tracing::info!("video source: reusing capturer");
             c
         }
-        None if std::env::var("LUMEN_VIDEO_SOURCE").is_ok_and(|v| v == "portal") => {
+        None if std::env::var("PUNKTFUNK_VIDEO_SOURCE").is_ok_and(|v| v == "portal") => {
             tracing::info!("video source: portal desktop capture");
             capture::open_portal_monitor().context("open portal capturer")?
         }
@@ -202,7 +202,7 @@ fn spawn_sender(
     drop_pct: u32,
 ) -> Result<()> {
     std::thread::Builder::new()
-        .name("lumen-send".into())
+        .name("punktfunk-send".into())
         .spawn(move || {
             // Chunk pacing: 16 packets per burst, bursts spread across the send budget.
             const PACE_CHUNK: usize = 16;
@@ -276,8 +276,8 @@ fn stream_body(
         frame.is_cuda(),
     )
     .context("open NVENC for stream")?;
-    // FEC overhead percent (Sunshine default 20). Override with LUMEN_FEC_PCT (0 = data-only).
-    let fec_pct: u8 = std::env::var("LUMEN_FEC_PCT")
+    // FEC overhead percent (Sunshine default 20). Override with PUNKTFUNK_FEC_PCT (0 = data-only).
+    let fec_pct: u8 = std::env::var("PUNKTFUNK_FEC_PCT")
         .ok()
         .and_then(|v| v.parse().ok())
         .unwrap_or(20);
@@ -294,7 +294,7 @@ fn stream_body(
     let mut fps_t = Instant::now();
     let stream_start = Instant::now();
     // Test knob: drop this % of outbound packets to exercise FEC recovery (0 = off).
-    let drop_pct: u32 = std::env::var("LUMEN_VIDEO_DROP")
+    let drop_pct: u32 = std::env::var("PUNKTFUNK_VIDEO_DROP")
         .ok()
         .and_then(|v| v.parse().ok())
         .unwrap_or(0);
@@ -313,9 +313,9 @@ fn stream_body(
         drop_pct,
     )?;
 
-    // Per-stage timing (LUMEN_PERF=1): max µs/stage per second + unique vs re-encoded frames,
+    // Per-stage timing (PUNKTFUNK_PERF=1): max µs/stage per second + unique vs re-encoded frames,
     // to pinpoint stalls. `unique` counts genuinely-new captured frames (vs re-encoded holds).
-    let perf = std::env::var_os("LUMEN_PERF").is_some();
+    let perf = std::env::var_os("PUNKTFUNK_PERF").is_some();
     let (mut mx_cap, mut mx_enc, mut mx_pkt, mut mx_send, mut mx_pkts, mut uniq) =
         (0u128, 0u128, 0u128, 0u128, 0usize, 0u32);
     // Absolute next-frame deadline — the single pacing clock for the loop.
diff --git a/crates/lumen-host/src/gamestream/tls.rs b/crates/punktfunk-host/src/gamestream/tls.rs
similarity index 100%
rename from crates/lumen-host/src/gamestream/tls.rs
rename to crates/punktfunk-host/src/gamestream/tls.rs
diff --git a/crates/lumen-host/src/gamestream/video.rs b/crates/punktfunk-host/src/gamestream/video.rs
similarity index 98%
rename from crates/lumen-host/src/gamestream/video.rs
rename to crates/punktfunk-host/src/gamestream/video.rs
index a1d4488d..70ce517d 100644
--- a/crates/lumen-host/src/gamestream/video.rs
+++ b/crates/punktfunk-host/src/gamestream/video.rs
@@ -6,7 +6,7 @@
 //! `docs/research/gamestream-protocol-research.json` (video plane).
 //!
 //! FEC (P1.5): each block carries `m = ⌈k·pct/100⌉` Reed–Solomon parity shards generated by
-//! `lumen_core::fec::Gf8Coder` (the nanors-compatible Cauchy GF(2⁸) coder). Crucially, RS runs
+//! `punktfunk_core::fec::Gf8Coder` (the nanors-compatible Cauchy GF(2⁸) coder). Crucially, RS runs
 //! over the **whole `blocksize` shard** — Moonlight decodes over `packetSize + 16` bytes from
 //! the datagram start (`RtpVideoQueue.c`), and rejects a recovered shard whose reconstructed
 //! `flags` byte isn't valid — so the NV header fields RS must reproduce (streamPacketIndex,
@@ -15,7 +15,7 @@
 //! Sunshine `stream.cpp`. `pct = 0` falls back to data-shards-only. Plaintext (AES-GCM video
 //! encryption is negotiated off for now).
 
-use lumen_core::fec::{ErasureCoder, Gf8Coder};
+use punktfunk_core::fec::{ErasureCoder, Gf8Coder};
 
 /// RTP `header` byte: version 2 (0x80) | extension (0x10) — Moonlight keys on the extension.
 const RTP_HEADER_BYTE: u8 = 0x80 | 0x10;
diff --git a/crates/lumen-host/src/inject.rs b/crates/punktfunk-host/src/inject.rs
similarity index 95%
rename from crates/lumen-host/src/inject.rs
rename to crates/punktfunk-host/src/inject.rs
index ef0d6857..0ed05769 100644
--- a/crates/lumen-host/src/inject.rs
+++ b/crates/punktfunk-host/src/inject.rs
@@ -1,4 +1,4 @@
-//! Input injection (plan §4): turn client [`lumen_core::input::InputEvent`]s into host input.
+//! Input injection (plan §4): turn client [`punktfunk_core::input::InputEvent`]s into host input.
 //!
 //! The headless Sway compositor runs with `WLR_LIBINPUT_NO_DEVICES=1`, so kernel `uinput`
 //! devices are never picked up. Instead we inject through the wlroots virtual-input Wayland
@@ -10,7 +10,7 @@
 //! keysyms correctly.
 
 use anyhow::Result;
-use lumen_core::input::InputEvent;
+use punktfunk_core::input::InputEvent;
 
 /// Injects input events into the host session. Not `Send`: an injector owns compositor
 /// resources (a Wayland connection, an xkb state) and lives entirely on the control thread
@@ -77,9 +77,9 @@ pub fn open(backend: Backend) -> Result<Box<dyn InputInjector>> {
 /// portal), so a gamescope session injects directly into it. wlroots/Sway only implements the
 /// ScreenCast portal (no RemoteDesktop), so libei can't run there — use the wlr virtual-input
 /// protocols. KWin and GNOME implement RemoteDesktop but not the wlr protocols, so use libei.
-/// `LUMEN_INPUT_BACKEND=wlr|libei|gamescope|uinput` overrides the auto-detection.
+/// `PUNKTFUNK_INPUT_BACKEND=wlr|libei|gamescope|uinput` overrides the auto-detection.
 pub fn default_backend() -> Backend {
-    if let Ok(v) = std::env::var("LUMEN_INPUT_BACKEND") {
+    if let Ok(v) = std::env::var("PUNKTFUNK_INPUT_BACKEND") {
         match v.trim().to_ascii_lowercase().as_str() {
             "wlr" | "wlroots" | "wlrvirtual" => return Backend::WlrVirtual,
             "libei" | "ei" | "portal" => return Backend::Libei,
@@ -87,11 +87,13 @@ pub fn default_backend() -> Backend {
             "uinput" => return Backend::Uinput,
             other => tracing::warn!(
                 value = other,
-                "unknown LUMEN_INPUT_BACKEND — auto-detecting"
+                "unknown PUNKTFUNK_INPUT_BACKEND — auto-detecting"
             ),
         }
     }
-    if std::env::var("LUMEN_COMPOSITOR").is_ok_and(|v| v.trim().eq_ignore_ascii_case("gamescope")) {
+    if std::env::var("PUNKTFUNK_COMPOSITOR")
+        .is_ok_and(|v| v.trim().eq_ignore_ascii_case("gamescope"))
+    {
         return Backend::GamescopeEi;
     }
     let desktop = std::env::var("XDG_CURRENT_DESKTOP").unwrap_or_default();
diff --git a/crates/lumen-host/src/inject/gamepad.rs b/crates/punktfunk-host/src/inject/gamepad.rs
similarity index 98%
rename from crates/lumen-host/src/inject/gamepad.rs
rename to crates/punktfunk-host/src/inject/gamepad.rs
index f23305f0..49f38cb6 100644
--- a/crates/lumen-host/src/inject/gamepad.rs
+++ b/crates/punktfunk-host/src/inject/gamepad.rs
@@ -13,7 +13,7 @@
 //!
 //! All ioctl numbers/struct layouts below were verified against this generation's
 //! `<linux/uinput.h>` on x86_64. `/dev/uinput` needs a udev rule + `input` group membership
-//! (see `scripts/60-lumen.rules`); creation fails with a clear error otherwise.
+//! (see `scripts/60-punktfunk.rules`); creation fails with a clear error otherwise.
 
 use crate::gamestream::gamepad::{self, GamepadFrame, MAX_PADS};
 use anyhow::{bail, Result};
@@ -213,7 +213,7 @@ impl VirtualPad {
         if raw < 0 {
             bail!(
                 "open /dev/uinput: {} (install the udev rule granting the 'input' group access \
-                 — see scripts/60-lumen.rules — and add the user to the 'input' group)",
+                 — see scripts/60-punktfunk.rules — and add the user to the 'input' group)",
                 std::io::Error::last_os_error()
             );
         }
diff --git a/crates/lumen-host/src/inject/libei.rs b/crates/punktfunk-host/src/inject/libei.rs
similarity index 98%
rename from crates/lumen-host/src/inject/libei.rs
rename to crates/punktfunk-host/src/inject/libei.rs
index fd315ab6..0ca5b90d 100644
--- a/crates/lumen-host/src/inject/libei.rs
+++ b/crates/punktfunk-host/src/inject/libei.rs
@@ -28,7 +28,7 @@ use ashpd::desktop::{
     CreateSessionOptions, PersistMode,
 };
 use futures_util::StreamExt;
-use lumen_core::input::{InputEvent, InputKind};
+use punktfunk_core::input::{InputEvent, InputKind};
 use reis::ei;
 use reis::event::{DeviceCapability, EiEvent};
 use std::os::unix::net::UnixStream;
@@ -61,7 +61,7 @@ impl LibeiInjector {
     pub fn open_with(source: EiSource) -> Result<Self> {
         let (tx, rx) = unbounded_channel::<InputEvent>();
         std::thread::Builder::new()
-            .name("lumen-libei".into())
+            .name("punktfunk-libei".into())
             .spawn(move || worker(rx, source))
             .map_err(|e| anyhow!("spawn libei worker thread: {e}"))?;
         // Return immediately — the portal/socket handshake must NOT run on the caller's
@@ -156,7 +156,7 @@ async fn connect(source: EiSource) -> Result<Connected> {
     };
     let context = ei::Context::new(stream).map_err(|e| anyhow!("reis EI context: {e}"))?;
     let (_conn, events) = context
-        .handshake_tokio("lumen-host", ei::handshake::ContextType::Sender)
+        .handshake_tokio("punktfunk-host", ei::handshake::ContextType::Sender)
         .await
         .map_err(|e| anyhow!("EI handshake: {e}"))?;
     Ok((portal, context, events))
diff --git a/crates/lumen-host/src/inject/wlr.rs b/crates/punktfunk-host/src/inject/wlr.rs
similarity index 99%
rename from crates/lumen-host/src/inject/wlr.rs
rename to crates/punktfunk-host/src/inject/wlr.rs
index 96c36668..e28c5961 100644
--- a/crates/lumen-host/src/inject/wlr.rs
+++ b/crates/punktfunk-host/src/inject/wlr.rs
@@ -7,7 +7,7 @@
 
 use super::{gs_button_to_evdev, vk_to_evdev, InputEvent, InputInjector};
 use anyhow::{bail, Context, Result};
-use lumen_core::input::InputKind;
+use punktfunk_core::input::InputKind;
 use std::io::Write;
 use std::os::fd::{AsFd, FromRawFd};
 use std::time::Instant;
@@ -261,7 +261,7 @@ impl InputInjector for WlrootsInjector {
 
 /// Create an anonymous in-memory file holding `s` + a trailing NUL (for the keymap fd).
 fn memfd_with(s: &str) -> Result<std::fs::File> {
-    let name = b"lumen-keymap\0";
+    let name = b"punktfunk-keymap\0";
     let fd = unsafe { libc::memfd_create(name.as_ptr() as *const libc::c_char, libc::MFD_CLOEXEC) };
     if fd < 0 {
         bail!("memfd_create failed: {}", std::io::Error::last_os_error());
diff --git a/crates/lumen-host/src/m0.rs b/crates/punktfunk-host/src/m0.rs
similarity index 90%
rename from crates/lumen-host/src/m0.rs
rename to crates/punktfunk-host/src/m0.rs
index 6682b0ad..3c46bbdd 100644
--- a/crates/lumen-host/src/m0.rs
+++ b/crates/punktfunk-host/src/m0.rs
@@ -1,5 +1,5 @@
 //! M0 — the pipeline spike (plan §8): capture → NVENC encode → playable file, with the
-//! encoded access units also fed through a `lumen_core` host→client `Session` over an
+//! encoded access units also fed through a `punktfunk_core` host→client `Session` over an
 //! in-process loopback to prove the core's FEC + packetize + reassemble path on real
 //! encoder output.
 //!
@@ -11,8 +11,8 @@
 use crate::capture::{self, Capturer, SyntheticCapturer};
 use crate::encode::{self, Codec, EncodedFrame, Encoder};
 use anyhow::{anyhow, Context, Result};
-use lumen_core::packet::{FLAG_PIC, FLAG_SOF};
-use lumen_core::{Config, Role, Session};
+use punktfunk_core::packet::{FLAG_PIC, FLAG_SOF};
+use punktfunk_core::{Config, Role, Session};
 use std::fs::File;
 use std::io::{BufWriter, Write};
 use std::path::PathBuf;
@@ -41,7 +41,7 @@ pub struct Options {
     pub bitrate_bps: u64,
     /// Raw Annex-B elementary-stream sink (`.h265`/`.h264`/`.ivf-less .obu`); playable.
     pub out: PathBuf,
-    /// Also round-trip every AU through a `lumen_core` host→client loopback and verify.
+    /// Also round-trip every AU through a `punktfunk_core` host→client loopback and verify.
     pub loopback: bool,
 }
 
@@ -66,11 +66,11 @@ pub fn run(opts: Options) -> Result<()> {
                 width = opts.width,
                 height = opts.height,
                 ?compositor,
-                "M0 source: virtual output (LUMEN_COMPOSITOR)"
+                "M0 source: virtual output (PUNKTFUNK_COMPOSITOR)"
             );
             let mut vd = crate::vdisplay::open(compositor).context("open virtual display")?;
             let vout = vd
-                .create(lumen_core::Mode {
+                .create(punktfunk_core::Mode {
                     width: opts.width,
                     height: opts.height,
                     refresh_hz: opts.fps,
@@ -112,7 +112,7 @@ pub fn run(opts: Options) -> Result<()> {
     );
 
     let mut lb = if opts.loopback {
-        Some(Loopback::new().context("build lumen-core loopback")?)
+        Some(Loopback::new().context("build punktfunk-core loopback")?)
     } else {
         None
     };
@@ -153,7 +153,7 @@ pub fn run(opts: Options) -> Result<()> {
         lb.report();
         if lb.mismatches > 0 || lb.recovered != lb.submitted {
             return Err(anyhow!(
-                "lumen-core loopback verification FAILED: {} mismatches, {}/{} AUs recovered",
+                "punktfunk-core loopback verification FAILED: {} mismatches, {}/{} AUs recovered",
                 lb.mismatches,
                 lb.recovered,
                 lb.submitted
@@ -191,7 +191,7 @@ fn drain_encoder(
     Ok(())
 }
 
-/// A host↔client `lumen_core` pair over a lossless in-process loopback. Each encoded AU is
+/// A host↔client `punktfunk_core` pair over a lossless in-process loopback. Each encoded AU is
 /// FEC-protected, packetized, sent, then reassembled on the client and byte-compared to the
 /// original — exercising the core on real encoder output (the M0 "feed into a Session" goal).
 struct Loopback {
@@ -205,7 +205,7 @@ struct Loopback {
 
 impl Loopback {
     fn new() -> Result<Loopback> {
-        let (host_tx, client_tx) = lumen_core::transport::loopback_pair(0, 0);
+        let (host_tx, client_tx) = punktfunk_core::transport::loopback_pair(0, 0);
         let host = Session::new(Config::p1_defaults(Role::Host), Box::new(host_tx))
             .map_err(|e| anyhow!("host session: {e:?}"))?;
         let client = Session::new(Config::p1_defaults(Role::Client), Box::new(client_tx))
@@ -246,7 +246,7 @@ impl Loopback {
                         );
                     }
                 }
-                Err(lumen_core::LumenError::NoFrame) => break,
+                Err(punktfunk_core::PunktfunkError::NoFrame) => break,
                 Err(e) => return Err(anyhow!("client poll_frame: {e:?}")),
             }
         }
@@ -259,7 +259,7 @@ impl Loopback {
             recovered = self.recovered,
             mismatches = self.mismatches,
             bytes = self.bytes,
-            "lumen-core loopback: AUs FEC-packetized → sent → reassembled & verified"
+            "punktfunk-core loopback: AUs FEC-packetized → sent → reassembled & verified"
         );
     }
 }
diff --git a/crates/lumen-host/src/m3.rs b/crates/punktfunk-host/src/m3.rs
similarity index 86%
rename from crates/lumen-host/src/m3.rs
rename to crates/punktfunk-host/src/m3.rs
index b35e3501..7a92ec6b 100644
--- a/crates/lumen-host/src/m3.rs
+++ b/crates/punktfunk-host/src/m3.rs
@@ -1,5 +1,5 @@
-//! M3 — the `lumen/1` native host: QUIC control plane + the hardened M1 data plane over UDP.
-//! This is lumen's own protocol, past the GameStream compatibility layer:
+//! M3 — the `punktfunk/1` native host: QUIC control plane + the hardened M1 data plane over UDP.
+//! This is punktfunk's own protocol, past the GameStream compatibility layer:
 //!
 //! * the Welcome negotiates **GF(2¹⁶) Leopard FEC** (inexpressible in GameStream) + AES-GCM;
 //! * the client's Hello requests a display mode and the host creates a **native virtual
@@ -9,26 +9,26 @@
 //! * video frames carry a wall-clock `pts_ns`, so a same-host client measures the full
 //!   capture→encode→FEC→UDP→reassemble latency per frame.
 //!
-//! `lumen-host m3-host [--port 9777] [--source synthetic|virtual] [--seconds 30]
+//! `punktfunk-host m3-host [--port 9777] [--source synthetic|virtual] [--seconds 30]
 //!  [--frames 300]` serves sessions back to back (one at a time — the virtual output and
-//!  encoder are single-tenant); `lumen-client-rs --connect host:9777` is the counterpart.
+//!  encoder are single-tenant); `punktfunk-client-rs --connect host:9777` is the counterpart.
 //!  The data plane runs on native threads (no async on the frame path).
 //!
 //! Alongside video + input, a session carries **audio** (desktop Opus, 5 ms frames, host →
-//! client QUIC datagrams tagged [`lumen_core::quic::AUDIO_MAGIC`]) and **gamepads** (client
+//! client QUIC datagrams tagged [`punktfunk_core::quic::AUDIO_MAGIC`]) and **gamepads** (client
 //! GamepadButton/GamepadAxis datagrams accumulated into per-pad state for the virtual xpad;
-//! force feedback flows back as [`lumen_core::quic::RUMBLE_MAGIC`] datagrams).
+//! force feedback flows back as [`punktfunk_core::quic::RUMBLE_MAGIC`] datagrams).
 //!
-//! Trust: the host serves with its persistent identity (`~/.config/lumen/cert.pem`, shared
+//! Trust: the host serves with its persistent identity (`~/.config/punktfunk/cert.pem`, shared
 //! with GameStream pairing) and logs the SHA-256 fingerprint clients pin.
 
 use anyhow::{anyhow, Context, Result};
-use lumen_core::config::{FecConfig, FecScheme, Role};
-use lumen_core::input::{InputEvent, InputKind};
-use lumen_core::packet::{FLAG_PIC, FLAG_SOF};
-use lumen_core::quic::{endpoint, io, Hello, Start, Welcome};
-use lumen_core::transport::UdpTransport;
-use lumen_core::Session;
+use punktfunk_core::config::{FecConfig, FecScheme, Role};
+use punktfunk_core::input::{InputEvent, InputKind};
+use punktfunk_core::packet::{FLAG_PIC, FLAG_SOF};
+use punktfunk_core::quic::{endpoint, io, Hello, Start, Welcome};
+use punktfunk_core::transport::UdpTransport;
+use punktfunk_core::Session;
 use rand::RngCore;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Arc;
@@ -88,7 +88,7 @@ fn fingerprint_hex(fp: &[u8; 32]) -> String {
 /// keeps serving — only endpoint-level failures are fatal.
 async fn serve(opts: M3Options) -> Result<()> {
     let identity = crate::gamestream::cert::ServerIdentity::load_or_create()
-        .context("load host identity (~/.config/lumen)")?;
+        .context("load host identity (~/.config/punktfunk)")?;
     let fingerprint = endpoint::fingerprint_of_pem(&identity.cert_pem)
         .map_err(|e| anyhow!("cert fingerprint: {e}"))?;
     let ep = endpoint::server_with_identity(
@@ -101,7 +101,7 @@ async fn serve(opts: M3Options) -> Result<()> {
         port = opts.port,
         source = ?opts.source,
         fingerprint = %fingerprint_hex(&fingerprint),
-        "lumen/1 host listening (QUIC) — clients pin this fingerprint"
+        "punktfunk/1 host listening (QUIC) — clients pin this fingerprint"
     );
 
     // One audio capturer for the whole host lifetime, handed from session to session
@@ -122,7 +122,7 @@ async fn serve(opts: M3Options) -> Result<()> {
             }
         };
         let peer = conn.remote_address();
-        tracing::info!(%peer, "lumen/1 client connected");
+        tracing::info!(%peer, "punktfunk/1 client connected");
         if let Err(e) = serve_session(conn, &opts, &audio_cap).await {
             tracing::warn!(%peer, error = %format!("{e:#}"), "session ended with error");
         } else {
@@ -164,10 +164,10 @@ async fn serve_session(
         let hello = Hello::decode(&io::read_msg(&mut recv).await?)
             .map_err(|e| anyhow!("Hello decode: {e:?}"))?;
         anyhow::ensure!(
-            hello.abi_version == lumen_core::ABI_VERSION,
+            hello.abi_version == punktfunk_core::ABI_VERSION,
             "ABI mismatch: client {} host {}",
             hello.abi_version,
-            lumen_core::ABI_VERSION
+            punktfunk_core::ABI_VERSION
         );
         crate::encode::validate_dimensions(
             crate::encode::Codec::H265,
@@ -184,10 +184,10 @@ async fn serve_session(
         let mut key = [0u8; 16];
         rand::thread_rng().fill_bytes(&mut key);
         let welcome = Welcome {
-            abi_version: lumen_core::ABI_VERSION,
+            abi_version: punktfunk_core::ABI_VERSION,
             udp_port,
             mode: hello.mode,
-            // The post-GameStream point of lumen/1: Leopard GF(2¹⁶) FEC + real encryption.
+            // The post-GameStream point of punktfunk/1: Leopard GF(2¹⁶) FEC + real encryption.
             fec: FecConfig {
                 scheme: FecScheme::Gf16,
                 fec_percent: 20,
@@ -196,7 +196,7 @@ async fn serve_session(
             shard_payload: 1200,
             encrypt: true,
             key,
-            salt: *b"lmn1",
+            salt: *b"pkf1",
             frames: match source {
                 M3Source::Synthetic => frames,
                 M3Source::Virtual => 0, // unbounded — client streams until we close
@@ -222,7 +222,7 @@ async fn serve_session(
     let input_handle = {
         let conn = conn.clone();
         std::thread::Builder::new()
-            .name("lumen-m3-input".into())
+            .name("punktfunk-m3-input".into())
             .spawn(move || input_thread(input_rx, conn))
             .context("spawn input thread")?
     };
@@ -260,7 +260,7 @@ async fn serve_session(
         let stop = stop.clone();
         let cap = audio_cap.clone();
         std::thread::Builder::new()
-            .name("lumen-m3-audio".into())
+            .name("punktfunk-m3-audio".into())
             .spawn(move || audio_thread(conn, stop, cap))
             .map_err(|e| tracing::error!(error = %e, "audio thread spawn failed — session continues without audio"))
             .ok()
@@ -313,8 +313,8 @@ async fn serve_session(
     result
 }
 
-/// Per-pad accumulated state: lumen/1 gamepad events are incremental (one button or axis
-/// per datagram, see `lumen_core::input::gamepad`), the virtual xpad applies full frames.
+/// Per-pad accumulated state: punktfunk/1 gamepad events are incremental (one button or axis
+/// per datagram, see `punktfunk_core::input::gamepad`), the virtual xpad applies full frames.
 #[derive(Clone, Copy, Default)]
 struct PadState {
     buttons: u32,
@@ -337,7 +337,7 @@ impl PadState {
             }
             return true;
         }
-        use lumen_core::input::gamepad::*;
+        use punktfunk_core::input::gamepad::*;
         let stick = ev.x.clamp(i16::MIN as i32, i16::MAX as i32) as i16;
         let trigger = ev.x.clamp(0, 255) as u8;
         match ev.code {
@@ -403,7 +403,7 @@ fn input_thread(rx: std::sync::mpsc::Receiver<InputEvent>, conn: quinn::Connecti
                         let backend = crate::inject::default_backend();
                         match crate::inject::open(backend) {
                             Ok(i) => {
-                                tracing::info!(?backend, "lumen/1 input injector opened");
+                                tracing::info!(?backend, "punktfunk/1 input injector opened");
                                 injector = Some(i);
                             }
                             Err(e) => {
@@ -430,14 +430,14 @@ fn input_thread(rx: std::sync::mpsc::Receiver<InputEvent>, conn: quinn::Connecti
                 *s = (low, high);
                 rumble_seen[pad as usize] = true;
             }
-            let d = lumen_core::quic::encode_rumble_datagram(pad, low, high);
+            let d = punktfunk_core::quic::encode_rumble_datagram(pad, low, high);
             let _ = conn.send_datagram(d.to_vec().into());
         });
         if last_refresh.elapsed() >= std::time::Duration::from_millis(500) {
             last_refresh = std::time::Instant::now();
             for (i, &(low, high)) in rumble_state.iter().enumerate() {
                 if rumble_seen[i] {
-                    let d = lumen_core::quic::encode_rumble_datagram(i as u16, low, high);
+                    let d = punktfunk_core::quic::encode_rumble_datagram(i as u16, low, high);
                     let _ = conn.send_datagram(d.to_vec().into());
                 }
             }
@@ -462,7 +462,7 @@ fn audio_thread(conn: quinn::Connection, stop: Arc<AtomicBool>, audio_cap: Audio
         None => match crate::audio::open_audio_capture() {
             Ok(c) => c,
             Err(e) => {
-                tracing::warn!(error = %format!("{e:#}"), "lumen/1 audio unavailable — session continues without it");
+                tracing::warn!(error = %format!("{e:#}"), "punktfunk/1 audio unavailable — session continues without it");
                 return;
             }
         },
@@ -487,7 +487,7 @@ fn audio_thread(conn: quinn::Connection, stop: Arc<AtomicBool>, audio_cap: Audio
     let mut opus_buf = vec![0u8; 1500];
     let mut seq: u32 = 0;
     let mut capture_dead = false;
-    tracing::info!("lumen/1 audio streaming (Opus 48 kHz stereo, 5 ms datagrams)");
+    tracing::info!("punktfunk/1 audio streaming (Opus 48 kHz stereo, 5 ms datagrams)");
     'session: while !stop.load(Ordering::SeqCst) {
         let chunk = match capturer.next_chunk() {
             Ok(c) => c,
@@ -503,7 +503,8 @@ fn audio_thread(conn: quinn::Connection, stop: Arc<AtomicBool>, audio_cap: Audio
             let pts_ns = now_ns();
             match enc.encode_float(&frame, &mut opus_buf) {
                 Ok(n) => {
-                    let d = lumen_core::quic::encode_audio_datagram(seq, pts_ns, &opus_buf[..n]);
+                    let d =
+                        punktfunk_core::quic::encode_audio_datagram(seq, pts_ns, &opus_buf[..n]);
                     if conn.send_datagram(d.into()).is_err() {
                         break 'session; // connection gone
                     }
@@ -520,12 +521,12 @@ fn audio_thread(conn: quinn::Connection, stop: Arc<AtomicBool>, audio_cap: Audio
     }
 }
 
-/// Stub — lumen/1 audio needs Linux (PipeWire capture + libopus); non-Linux dev builds
+/// Stub — punktfunk/1 audio needs Linux (PipeWire capture + libopus); non-Linux dev builds
 /// run sessions without it, same as when the capturer fails to open.
 #[cfg(not(target_os = "linux"))]
 fn audio_thread(_conn: quinn::Connection, _stop: Arc<AtomicBool>, _audio_cap: AudioCapSlot) {
     tracing::warn!(
-        "lumen/1 audio requires Linux (PipeWire + libopus) — session continues without it"
+        "punktfunk/1 audio requires Linux (PipeWire + libopus) — session continues without it"
     );
 }
 
@@ -545,16 +546,16 @@ fn synthetic_stream(session: &mut Session, frames: u32, stop: &AtomicBool) -> Re
     Ok(())
 }
 
-/// Real capture→encode→lumen/1: a native virtual output at the client's mode, NVENC AUs
+/// Real capture→encode→punktfunk/1: a native virtual output at the client's mode, NVENC AUs
 /// stamped with the capture wall clock (the client derives per-frame pipeline latency).
 fn virtual_stream(
     session: &mut Session,
-    mode: lumen_core::Mode,
+    mode: punktfunk_core::Mode,
     seconds: u32,
     stop: &AtomicBool,
 ) -> Result<()> {
     let compositor = crate::vdisplay::detect().context("detect compositor")?;
-    tracing::info!(?compositor, ?mode, "lumen/1 virtual display");
+    tracing::info!(?compositor, ?mode, "punktfunk/1 virtual display");
     let mut vd = crate::vdisplay::open(compositor)?;
     let vout = vd.create(mode).context("create virtual output")?;
     let mut capturer =
@@ -600,7 +601,7 @@ fn virtual_stream(
             None => next = std::time::Instant::now(),
         }
     }
-    tracing::info!(sent, "lumen/1 virtual stream complete");
+    tracing::info!(sent, "punktfunk/1 virtual stream complete");
     Ok(())
 }
 
@@ -622,7 +623,7 @@ mod tests {
     /// Incremental wire events accumulate into the full pad frame the virtual xpad applies.
     #[test]
     fn gamepad_accumulator() {
-        use lumen_core::input::gamepad::*;
+        use punktfunk_core::input::gamepad::*;
         let mut s = PadState::default();
         assert!(s.apply(&gp(InputKind::GamepadButton, BTN_A, 1, 0)));
         assert!(s.apply(&gp(InputKind::GamepadButton, BTN_LB, 1, 0)));
@@ -640,20 +641,22 @@ mod tests {
         assert_eq!(s.left_trigger, 255);
         assert!(!s.apply(&gp(InputKind::GamepadAxis, 42, 1, 0)));
 
-        // The lumen/1 button bits are the GameStream bits — one wire contract end to end.
+        // The punktfunk/1 button bits are the GameStream bits — one wire contract end to end.
         assert_eq!(BTN_A, crate::gamestream::gamepad::BTN_A);
         assert_eq!(BTN_GUIDE, crate::gamestream::gamepad::BTN_GUIDE);
         assert_eq!(BTN_DPAD_UP, crate::gamestream::gamepad::BTN_DPAD_UP);
     }
 
     /// Pull and byte-verify `count` synthetic frames through the C ABI connection.
-    unsafe fn pull_verified(conn: *mut lumen_core::abi::LumenConnection, count: u32) {
-        use lumen_core::error::LumenStatus;
+    unsafe fn pull_verified(conn: *mut punktfunk_core::abi::PunktfunkConnection, count: u32) {
+        use punktfunk_core::error::PunktfunkStatus;
         let mut got = 0u32;
         let mut frame = unsafe { std::mem::zeroed() };
         while got < count {
-            match unsafe { lumen_core::abi::lumen_connection_next_au(conn, &mut frame, 2000) } {
-                LumenStatus::Ok => {
+            match unsafe {
+                punktfunk_core::abi::punktfunk_connection_next_au(conn, &mut frame, 2000)
+            } {
+                PunktfunkStatus::Ok => {
                     let data = unsafe { std::slice::from_raw_parts(frame.data, frame.len) };
                     let idx = u32::from_le_bytes(data[0..4].try_into().unwrap());
                     assert_eq!(
@@ -663,24 +666,24 @@ mod tests {
                     );
                     got += 1;
                 }
-                LumenStatus::NoFrame => continue,
+                PunktfunkStatus::NoFrame => continue,
                 other => panic!("next_au: {other:?}"),
             }
         }
     }
 
     /// End-to-end through the C ABI — the exact contract platform clients (Swift) link:
-    /// in-process lumen/1 host, `lumen_connect` (TOFU → pinned reconnect) →
-    /// `lumen_connection_next_au` pulls verified frames → `lumen_connection_send_input`
-    /// enqueues → `lumen_connection_close`. Three sequential sessions against ONE host
+    /// in-process punktfunk/1 host, `punktfunk_connect` (TOFU → pinned reconnect) →
+    /// `punktfunk_connection_next_au` pulls verified frames → `punktfunk_connection_send_input`
+    /// enqueues → `punktfunk_connection_close`. Three sequential sessions against ONE host
     /// process prove the persistent listener, and a wrong pin is rejected.
     #[test]
     fn c_abi_connection_roundtrip() {
-        use lumen_core::abi::{
-            lumen_connect, lumen_connection_close, lumen_connection_mode,
-            lumen_connection_send_input,
+        use punktfunk_core::abi::{
+            punktfunk_connect, punktfunk_connection_close, punktfunk_connection_mode,
+            punktfunk_connection_send_input,
         };
-        use lumen_core::error::LumenStatus;
+        use punktfunk_core::error::PunktfunkStatus;
 
         let host = std::thread::spawn(|| {
             run(M3Options {
@@ -697,7 +700,7 @@ mod tests {
         let addr = std::ffi::CString::new("127.0.0.1").unwrap();
         let mut observed = [0u8; 32];
         let conn = unsafe {
-            lumen_connect(
+            punktfunk_connect(
                 addr.as_ptr(),
                 19777,
                 1280,
@@ -708,20 +711,20 @@ mod tests {
                 10_000,
             )
         };
-        assert!(!conn.is_null(), "lumen_connect failed");
+        assert!(!conn.is_null(), "punktfunk_connect failed");
         assert_ne!(observed, [0u8; 32], "fingerprint not reported");
 
         let (mut w, mut h, mut hz) = (0u32, 0u32, 0u32);
         assert_eq!(
-            unsafe { lumen_connection_mode(conn, &mut w, &mut h, &mut hz) },
-            LumenStatus::Ok
+            unsafe { punktfunk_connection_mode(conn, &mut w, &mut h, &mut hz) },
+            PunktfunkStatus::Ok
         );
         assert_eq!((w, h, hz), (1280, 720, 60));
 
         unsafe { pull_verified(conn, 25) };
 
-        let ev = lumen_core::input::InputEvent {
-            kind: lumen_core::input::InputKind::MouseMove,
+        let ev = punktfunk_core::input::InputEvent {
+            kind: punktfunk_core::input::InputKind::MouseMove,
             _pad: [0; 3],
             code: 0,
             x: 1,
@@ -729,14 +732,14 @@ mod tests {
             flags: 0,
         };
         assert_eq!(
-            unsafe { lumen_connection_send_input(conn, &ev) },
-            LumenStatus::Ok
+            unsafe { punktfunk_connection_send_input(conn, &ev) },
+            PunktfunkStatus::Ok
         );
-        unsafe { lumen_connection_close(conn) };
+        unsafe { punktfunk_connection_close(conn) };
 
         // Session 2 (same host process — the listener survived): pin the fingerprint.
         let conn2 = unsafe {
-            lumen_connect(
+            punktfunk_connect(
                 addr.as_ptr(),
                 19777,
                 1280,
@@ -749,12 +752,12 @@ mod tests {
         };
         assert!(!conn2.is_null(), "pinned reconnect failed");
         unsafe { pull_verified(conn2, 25) };
-        unsafe { lumen_connection_close(conn2) };
+        unsafe { punktfunk_connection_close(conn2) };
 
         // Session 3: a wrong pin must be rejected by the handshake.
         let bad = [0xAAu8; 32];
         let conn3 = unsafe {
-            lumen_connect(
+            punktfunk_connect(
                 addr.as_ptr(),
                 19777,
                 1280,
@@ -771,7 +774,7 @@ mod tests {
         // handshake never yields a connection, so accept() is still waiting. Connect once
         // more (TOFU) to complete the host's third session and let it exit.
         let conn4 = unsafe {
-            lumen_connect(
+            punktfunk_connect(
                 addr.as_ptr(),
                 19777,
                 1280,
@@ -784,7 +787,7 @@ mod tests {
         };
         assert!(!conn4.is_null());
         unsafe { pull_verified(conn4, 25) };
-        unsafe { lumen_connection_close(conn4) };
+        unsafe { punktfunk_connection_close(conn4) };
 
         host.join().unwrap().unwrap();
     }
diff --git a/crates/lumen-host/src/main.rs b/crates/punktfunk-host/src/main.rs
similarity index 89%
rename from crates/lumen-host/src/main.rs
rename to crates/punktfunk-host/src/main.rs
index 7d14f13c..f8128885 100644
--- a/crates/lumen-host/src/main.rs
+++ b/crates/punktfunk-host/src/main.rs
@@ -1,13 +1,13 @@
-//! `lumen-host` — the Linux streaming host (plan §2, §6, §7).
+//! `punktfunk-host` — the Linux streaming host (plan §2, §6, §7).
 //!
 //! Creates a client-sized virtual display, captures it via PipeWire, encodes with
-//! VAAPI/NVENC, and hands encoded access units to `lumen_core` for FEC + packetization +
+//! VAAPI/NVENC, and hands encoded access units to `punktfunk_core` for FEC + packetization +
 //! pacing + send. Input flows back via libei/uinput. The platform backends are
 //! `#[cfg(target_os = "linux")]`; the crate compiles everywhere so the workspace builds
 //! on non-Linux dev machines — it just can't run the pipeline there.
 //!
 //! Status: M0. The `m0` subcommand runs the capture→encode→file pipeline spike and feeds
-//! the encoded AUs through a `lumen_core` loopback. M2 wires the full P1 host that a stock
+//! the encoded AUs through a `punktfunk_core` loopback. M2 wires the full P1 host that a stock
 //! Moonlight client connects to.
 
 // Scaffold: trait methods and config paths are defined ahead of their backends.
@@ -33,7 +33,7 @@ use m0::{Options, Source};
 use std::path::PathBuf;
 
 fn main() {
-    // Logs go to stderr so stdout stays machine-readable (`lumen-host openapi > spec.json`).
+    // Logs go to stderr so stdout stays machine-readable (`punktfunk-host openapi > spec.json`).
     tracing_subscriber::fmt()
         .with_env_filter(
             tracing_subscriber::EnvFilter::try_from_default_env().unwrap_or_else(|_| "info".into()),
@@ -48,7 +48,10 @@ fn main() {
 }
 
 fn real_main() -> Result<()> {
-    tracing::info!("lumen-host (lumen_core ABI v{})", lumen_core::ABI_VERSION);
+    tracing::info!(
+        "punktfunk-host (punktfunk_core ABI v{})",
+        punktfunk_core::ABI_VERSION
+    );
 
     let args: Vec<String> = std::env::args().skip(1).collect();
     match args.first().map(String::as_str) {
@@ -67,7 +70,7 @@ fn real_main() -> Result<()> {
         Some("zerocopy-probe") => zerocopy::probe(),
         // M0 pipeline spike.
         Some("m0") => m0::run(parse_m0(&args[1..])?),
-        // M3: native lumen/1 host (QUIC control plane + UDP data plane).
+        // M3: native punktfunk/1 host (QUIC control plane + UDP data plane).
         Some("m3-host") => {
             let get = |flag: &str| {
                 args.iter()
@@ -102,7 +105,7 @@ fn real_main() -> Result<()> {
 /// KWin/GNOME, wlr on Sway). Lets us validate input injection without a Moonlight client.
 #[cfg(target_os = "linux")]
 fn input_test() -> Result<()> {
-    use lumen_core::input::{InputEvent, InputKind};
+    use punktfunk_core::input::{InputEvent, InputKind};
     use std::time::Duration;
 
     let backend = inject::default_backend();
@@ -188,7 +191,7 @@ fn parse_serve(args: &[String]) -> Result<mgmt::Options> {
     }
     // Flag wins over the environment so a unit file can set a default and a shell override it.
     if opts.token.is_none() {
-        opts.token = std::env::var("LUMEN_MGMT_TOKEN")
+        opts.token = std::env::var("PUNKTFUNK_MGMT_TOKEN")
             .ok()
             .filter(|t| !t.is_empty());
     }
@@ -276,7 +279,7 @@ fn parse_m0(args: &[String]) -> Result<Options> {
             Codec::H265 => "h265",
             Codec::Av1 => "obu",
         };
-        PathBuf::from(format!("/tmp/lumen-m0.{ext}"))
+        PathBuf::from(format!("/tmp/punktfunk-m0.{ext}"))
     });
 
     Ok(Options {
@@ -294,18 +297,18 @@ fn parse_m0(args: &[String]) -> Result<Options> {
 
 fn print_usage() {
     eprintln!(
-        "lumen-host — Linux streaming host
+        "punktfunk-host — Linux streaming host
 
 USAGE:
-    lumen-host serve [OPTIONS]    GameStream host control plane (M2: mDNS + serverinfo …)
+    punktfunk-host serve [OPTIONS]    GameStream host control plane (M2: mDNS + serverinfo …)
                                   + the management REST API
-    lumen-host openapi            print the management API's OpenAPI document (codegen)
-    lumen-host m3-host [OPTIONS]  native lumen/1 host (QUIC control plane + UDP data plane)
-    lumen-host m0 [OPTIONS]       M0 capture→encode→file pipeline spike
+    punktfunk-host openapi            print the management API's OpenAPI document (codegen)
+    punktfunk-host m3-host [OPTIONS]  native punktfunk/1 host (QUIC control plane + UDP data plane)
+    punktfunk-host m0 [OPTIONS]       M0 capture→encode→file pipeline spike
 
 SERVE OPTIONS:
     --mgmt-bind <IP:PORT>        management API address (default: 127.0.0.1:47990)
-    --mgmt-token <TOKEN>         bearer token for the management API (or LUMEN_MGMT_TOKEN);
+    --mgmt-token <TOKEN>         bearer token for the management API (or PUNKTFUNK_MGMT_TOKEN);
                                  required when --mgmt-bind is not loopback
 
 M3-HOST OPTIONS:
@@ -324,14 +327,14 @@ M0 OPTIONS:
     --codec <h264|h265|av1>      NVENC codec (default: h265)
     --bitrate <MBPS>             target bitrate in Mbps (default: 20)
     --width <W> --height <H>     synthetic source size (default: 1920x1080)
-    --out <PATH>                 raw Annex-B output (default: /tmp/lumen-m0.<ext>)
-    --no-loopback                skip the lumen_core round-trip verification
+    --out <PATH>                 raw Annex-B output (default: /tmp/punktfunk-m0.<ext>)
+    --no-loopback                skip the punktfunk_core round-trip verification
     -h, --help                   this help
 
 NOTES:
     'portal' needs headless Sway + xdg-desktop-portal-wlr running in this session
     (see docs/linux-setup.md). 'synthetic' needs no capture session and always runs.
     Encoded AUs are written to a playable file AND (unless --no-loopback) fed through a
-    lumen_core host→client loopback that reassembles and byte-verifies each one."
+    punktfunk_core host→client loopback that reassembles and byte-verifies each one."
     );
 }
diff --git a/crates/lumen-host/src/mgmt.rs b/crates/punktfunk-host/src/mgmt.rs
similarity index 97%
rename from crates/lumen-host/src/mgmt.rs
rename to crates/punktfunk-host/src/mgmt.rs
index 0407d866..1c673192 100644
--- a/crates/lumen-host/src/mgmt.rs
+++ b/crates/punktfunk-host/src/mgmt.rs
@@ -4,12 +4,12 @@
 //! the per-frame pipeline never touches this module.
 //!
 //! The API is versioned under `/api/v1` and described by an OpenAPI 3.1 document generated
-//! at compile time with `utoipa` — `lumen-host openapi` prints it for client codegen, the
+//! at compile time with `utoipa` — `punktfunk-host openapi` prints it for client codegen, the
 //! running server serves it at `/api/v1/openapi.json` plus interactive docs at `/api/docs`,
 //! and a copy is checked in at `docs/api/openapi.json` (a test fails if it drifts, like the
 //! cbindgen header).
 //!
-//! Security: binds loopback by default. A bearer token (`--mgmt-token` / `LUMEN_MGMT_TOKEN`)
+//! Security: binds loopback by default. A bearer token (`--mgmt-token` / `PUNKTFUNK_MGMT_TOKEN`)
 //! is enforced on every `/api/v1` route except `/api/v1/health`, and is mandatory for
 //! non-loopback binds. The OpenAPI document and docs UI are served unauthenticated (the
 //! spec is public knowledge — it lives in this repo).
@@ -73,7 +73,7 @@ pub async fn run(state: Arc<AppState>, opts: Options) -> Result<()> {
     let token = opts.token.filter(|t| !t.trim().is_empty());
     if token.is_none() && !opts.bind.ip().is_loopback() {
         bail!(
-            "management API bind {} is not loopback — set --mgmt-token (or LUMEN_MGMT_TOKEN) \
+            "management API bind {} is not loopback — set --mgmt-token (or PUNKTFUNK_MGMT_TOKEN) \
              to expose it beyond this machine",
             opts.bind
         );
@@ -131,7 +131,7 @@ fn api_router_parts() -> (Router<Arc<MgmtState>>, utoipa::openapi::OpenApi) {
         .split_for_parts()
 }
 
-/// The OpenAPI document as pretty JSON — what `lumen-host openapi` prints and what is
+/// The OpenAPI document as pretty JSON — what `punktfunk-host openapi` prints and what is
 /// checked in at `docs/api/openapi.json` for client codegen.
 pub fn openapi_json() -> String {
     let (_, api) = api_router_parts();
@@ -143,8 +143,8 @@ pub fn openapi_json() -> String {
 #[derive(OpenApi)]
 #[openapi(
     info(
-        title = "lumen management API",
-        description = "Control-plane API for managing a lumen streaming host: host \
+        title = "punktfunk management API",
+        description = "Control-plane API for managing a punktfunk streaming host: host \
                        capabilities, runtime status, paired clients, the pairing PIN flow, \
                        and session control. Authentication: HTTP bearer token, enforced on \
                        every route except `/api/v1/health` when the host is started with a \
@@ -191,9 +191,9 @@ struct Health {
     /// Always `"ok"` when the host responds.
     #[schema(example = "ok")]
     status: String,
-    /// `lumen-host` crate version.
+    /// `punktfunk-host` crate version.
     version: String,
-    /// `lumen-core` C ABI version.
+    /// `punktfunk-core` C ABI version.
     abi_version: u32,
 }
 
@@ -205,9 +205,9 @@ struct HostInfo {
     uniqueid: String,
     /// Best-effort primary LAN IP.
     local_ip: String,
-    /// `lumen-host` crate version.
+    /// `punktfunk-host` crate version.
     version: String,
-    /// `lumen-core` C ABI version.
+    /// `punktfunk-core` C ABI version.
     abi_version: u32,
     /// GameStream host version advertised to Moonlight clients.
     app_version: String,
@@ -407,7 +407,7 @@ async fn get_health() -> Json<Health> {
     Json(Health {
         status: "ok".into(),
         version: env!("CARGO_PKG_VERSION").into(),
-        abi_version: lumen_core::ABI_VERSION,
+        abi_version: punktfunk_core::ABI_VERSION,
     })
 }
 
@@ -429,7 +429,7 @@ async fn get_host_info(State(st): State<Arc<MgmtState>>) -> Json<HostInfo> {
         uniqueid: h.uniqueid.clone(),
         local_ip: h.local_ip.to_string(),
         version: env!("CARGO_PKG_VERSION").into(),
-        abi_version: lumen_core::ABI_VERSION,
+        abi_version: punktfunk_core::ABI_VERSION,
         app_version: APP_VERSION.into(),
         gfe_version: GFE_VERSION.into(),
         // Everything NVENC encodes here (mirrors SERVER_CODEC_MODE_SUPPORT = 3843).
@@ -717,7 +717,7 @@ mod tests {
         let (status, body) = send(&app, get_req("/api/v1/health")).await;
         assert_eq!(status, StatusCode::OK);
         assert_eq!(body["status"], "ok");
-        assert_eq!(body["abi_version"], lumen_core::ABI_VERSION);
+        assert_eq!(body["abi_version"], punktfunk_core::ABI_VERSION);
     }
 
     #[tokio::test]
@@ -813,7 +813,7 @@ mod tests {
         let (status, body) = send(&app, get_req("/api/v1/clients")).await;
         assert_eq!(status, StatusCode::OK);
         assert_eq!(body[0]["fingerprint"], fingerprint);
-        assert_eq!(body[0]["subject"], "CN=lumen");
+        assert_eq!(body[0]["subject"], "CN=punktfunk");
 
         // Malformed fingerprint → 400.
         let bad = axum::http::Request::delete("/api/v1/clients/zz")
@@ -973,7 +973,7 @@ mod tests {
             json.trim(),
             checked_in.trim(),
             "docs/api/openapi.json is stale — regenerate with: \
-             cargo run -p lumen-host -- openapi > docs/api/openapi.json"
+             cargo run -p punktfunk-host -- openapi > docs/api/openapi.json"
         );
     }
 }
diff --git a/crates/lumen-host/src/pipeline.rs b/crates/punktfunk-host/src/pipeline.rs
similarity index 84%
rename from crates/lumen-host/src/pipeline.rs
rename to crates/punktfunk-host/src/pipeline.rs
index 3e3ce20b..71f338a3 100644
--- a/crates/lumen-host/src/pipeline.rs
+++ b/crates/punktfunk-host/src/pipeline.rs
@@ -1,4 +1,4 @@
-//! The host hot path (plan §7), wiring the platform stages to `lumen_core`:
+//! The host hot path (plan §7), wiring the platform stages to `punktfunk_core`:
 //!
 //! ```text
 //! capture(dmabuf) → encode(NVENC/VAAPI) → core[FEC+packetize+pace+send]
@@ -10,11 +10,11 @@
 use crate::capture::Capturer;
 use crate::encode::{EncodedFrame, Encoder};
 use anyhow::Result;
-use lumen_core::packet::{FLAG_PIC, FLAG_SOF};
-use lumen_core::Session;
+use punktfunk_core::packet::{FLAG_PIC, FLAG_SOF};
+use punktfunk_core::Session;
 
 /// Drive one capture→encode→submit step. The real pipeline spawns threads and uses
-/// bounded channels; this documents the data flow and the `lumen_core` submit contract.
+/// bounded channels; this documents the data flow and the `punktfunk_core` submit contract.
 pub fn pump_once(
     capturer: &mut dyn Capturer,
     encoder: &mut dyn Encoder,
diff --git a/crates/lumen-host/src/pwinit.rs b/crates/punktfunk-host/src/pwinit.rs
similarity index 100%
rename from crates/lumen-host/src/pwinit.rs
rename to crates/punktfunk-host/src/pwinit.rs
diff --git a/crates/lumen-host/src/vdisplay.rs b/crates/punktfunk-host/src/vdisplay.rs
similarity index 92%
rename from crates/lumen-host/src/vdisplay.rs
rename to crates/punktfunk-host/src/vdisplay.rs
index 028158d4..d74fb627 100644
--- a/crates/lumen-host/src/vdisplay.rs
+++ b/crates/punktfunk-host/src/vdisplay.rs
@@ -14,7 +14,7 @@
 //! consumes the node via [`crate::capture::capture_virtual_output`].
 
 use anyhow::Result;
-pub use lumen_core::Mode;
+pub use punktfunk_core::Mode;
 use std::os::fd::OwnedFd;
 
 /// A created virtual output: a PipeWire source to capture, plus an owned keepalive whose drop
@@ -46,7 +46,7 @@ pub trait VirtualDisplay: Send {
     fn create(&mut self, mode: Mode) -> Result<VirtualOutput>;
 }
 
-/// Compositors lumen knows how to drive (plan §6).
+/// Compositors punktfunk knows how to drive (plan §6).
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum Compositor {
     /// KWin / Plasma 6 — `zkde_screencast` virtual output.
@@ -59,16 +59,18 @@ pub enum Compositor {
     Gamescope,
 }
 
-/// Detect the compositor to drive: `LUMEN_COMPOSITOR` override, else `XDG_CURRENT_DESKTOP`.
+/// Detect the compositor to drive: `PUNKTFUNK_COMPOSITOR` override, else `XDG_CURRENT_DESKTOP`.
 pub fn detect() -> Result<Compositor> {
-    if let Ok(v) = std::env::var("LUMEN_COMPOSITOR") {
+    if let Ok(v) = std::env::var("PUNKTFUNK_COMPOSITOR") {
         return match v.trim().to_ascii_lowercase().as_str() {
             "kwin" | "kde" | "plasma" => Ok(Compositor::Kwin),
             "wlroots" | "sway" | "hyprland" | "wlr" => Ok(Compositor::Wlroots),
             "mutter" | "gnome" => Ok(Compositor::Mutter),
             "gamescope" => Ok(Compositor::Gamescope),
             other => {
-                anyhow::bail!("unknown LUMEN_COMPOSITOR '{other}' (kwin|wlroots|mutter|gamescope)")
+                anyhow::bail!(
+                    "unknown PUNKTFUNK_COMPOSITOR '{other}' (kwin|wlroots|mutter|gamescope)"
+                )
             }
         };
     }
@@ -86,7 +88,7 @@ pub fn detect() -> Result<Compositor> {
         Ok(Compositor::Wlroots)
     } else {
         anyhow::bail!(
-            "could not detect compositor from XDG_CURRENT_DESKTOP='{desktop}'; set LUMEN_COMPOSITOR"
+            "could not detect compositor from XDG_CURRENT_DESKTOP='{desktop}'; set PUNKTFUNK_COMPOSITOR"
         )
     }
 }
diff --git a/crates/lumen-host/src/vdisplay/gamescope.rs b/crates/punktfunk-host/src/vdisplay/gamescope.rs
similarity index 90%
rename from crates/lumen-host/src/vdisplay/gamescope.rs
rename to crates/punktfunk-host/src/vdisplay/gamescope.rs
index cf940f72..e5f70437 100644
--- a/crates/lumen-host/src/vdisplay/gamescope.rs
+++ b/crates/punktfunk-host/src/vdisplay/gamescope.rs
@@ -35,11 +35,11 @@ impl VirtualDisplay for GamescopeDisplay {
 
     fn create(&mut self, mode: Mode) -> Result<VirtualOutput> {
         // Attach to an already-running gamescope (debug / Steam-launched session) instead of
-        // spawning one: LUMEN_GAMESCOPE_NODE=<pipewire node id>.
-        if let Ok(id) = std::env::var("LUMEN_GAMESCOPE_NODE") {
+        // spawning one: PUNKTFUNK_GAMESCOPE_NODE=<pipewire node id>.
+        if let Ok(id) = std::env::var("PUNKTFUNK_GAMESCOPE_NODE") {
             let node_id: u32 = id
                 .parse()
-                .context("LUMEN_GAMESCOPE_NODE must be a node id")?;
+                .context("PUNKTFUNK_GAMESCOPE_NODE must be a node id")?;
             tracing::info!(node_id, "gamescope: attaching to existing PipeWire node");
             return Ok(VirtualOutput {
                 node_id,
@@ -54,7 +54,7 @@ impl VirtualDisplay for GamescopeDisplay {
         let node_id = wait_for_node(Duration::from_secs(15)).ok_or_else(|| {
             anyhow!(
                 "gamescope PipeWire node did not appear within 15s — gamescope may have failed to \
-                 start or headless capture is unsupported on this GPU/driver (see /tmp/lumen-gamescope.log)"
+                 start or headless capture is unsupported on this GPU/driver (see /tmp/punktfunk-gamescope.log)"
             )
         })?;
         tracing::info!(
@@ -75,16 +75,17 @@ impl VirtualDisplay for GamescopeDisplay {
 
 /// File where the wrapper below writes gamescope's `LIBEI_SOCKET` (its EIS server socket),
 /// read by the libei injector to drive input into the nested app. See [`crate::inject`].
-pub const EI_SOCKET_FILE: &str = "/tmp/lumen-gamescope-ei";
+pub const EI_SOCKET_FILE: &str = "/tmp/punktfunk-gamescope-ei";
 
 /// Spawn `gamescope --backend headless -W w -H h -r hz -- <app>`. The app comes from
-/// `LUMEN_GAMESCOPE_APP` (default a no-op that just keeps gamescope alive — set it to a real
+/// `PUNKTFUNK_GAMESCOPE_APP` (default a no-op that just keeps gamescope alive — set it to a real
 /// game/GL app for actual content, e.g. `steam -gamepadui` for the SteamOS-like session).
-/// stdout/stderr go to `/tmp/lumen-gamescope.log`. The app is launched through a tiny shell
+/// stdout/stderr go to `/tmp/punktfunk-gamescope.log`. The app is launched through a tiny shell
 /// wrapper that relays gamescope's `LIBEI_SOCKET` (set for its children) to [`EI_SOCKET_FILE`]
 /// so the input injector can connect to gamescope's EIS server from outside.
 fn spawn(w: u32, h: u32, hz: u32) -> Result<Child> {
-    let app = std::env::var("LUMEN_GAMESCOPE_APP").unwrap_or_else(|_| "sleep infinity".to_string());
+    let app =
+        std::env::var("PUNKTFUNK_GAMESCOPE_APP").unwrap_or_else(|_| "sleep infinity".to_string());
     let _ = std::fs::remove_file(EI_SOCKET_FILE); // stale socket path from a previous session
     let mut cmd = Command::new("gamescope");
     cmd.args(["--backend", "headless"])
@@ -101,7 +102,7 @@ fn spawn(w: u32, h: u32, hz: u32) -> Result<Child> {
         .args(app.split_whitespace())
         // Prefer the NVIDIA GL vendor for the nested session (harmless on a pure-NVIDIA box).
         .env("__GLX_VENDOR_LIBRARY_NAME", "nvidia");
-    if let Ok(log) = std::fs::File::create("/tmp/lumen-gamescope.log") {
+    if let Ok(log) = std::fs::File::create("/tmp/punktfunk-gamescope.log") {
         if let Ok(log2) = log.try_clone() {
             cmd.stdout(Stdio::from(log)).stderr(Stdio::from(log2));
         }
@@ -132,7 +133,7 @@ fn wait_for_node(timeout: Duration) -> Option<u32> {
 
 /// Parse `stream available on node ID: N` from the spawned gamescope's log (ANSI-colored).
 fn node_from_log() -> Option<u32> {
-    let log = std::fs::read_to_string("/tmp/lumen-gamescope.log").ok()?;
+    let log = std::fs::read_to_string("/tmp/punktfunk-gamescope.log").ok()?;
     for line in log.lines().rev() {
         if let Some(pos) = line.find("stream available on node ID:") {
             let tail = &line[pos + "stream available on node ID:".len()..];
diff --git a/crates/lumen-host/src/vdisplay/kwin.rs b/crates/punktfunk-host/src/vdisplay/kwin.rs
similarity index 99%
rename from crates/lumen-host/src/vdisplay/kwin.rs
rename to crates/punktfunk-host/src/vdisplay/kwin.rs
index b7251102..8d2a85eb 100644
--- a/crates/lumen-host/src/vdisplay/kwin.rs
+++ b/crates/punktfunk-host/src/vdisplay/kwin.rs
@@ -53,7 +53,7 @@ use zkde::zkde_screencast_unstable_v1::ZkdeScreencastUnstableV1 as Screencast;
 const POINTER_EMBEDDED: u32 = 2;
 
 /// The name we give the created output; KWin exposes it to output-management as `Virtual-<name>`.
-const VOUT_NAME: &str = "lumen";
+const VOUT_NAME: &str = "punktfunk";
 
 /// Highest interface version we drive. KWin currently advertises 5; we rely on the `created`
 /// event (deprecated only since v6) for the node id, so cap the bind at 5.
@@ -80,7 +80,7 @@ impl VirtualDisplay for KwinDisplay {
         let stop_thread = stop.clone();
         let (width, height) = (mode.width, mode.height);
         thread::Builder::new()
-            .name("lumen-kwin-vout".into())
+            .name("punktfunk-kwin-vout".into())
             .spawn(move || virtual_output_thread(width, height, setup_tx, stop_thread))
             .context("spawn KWin virtual-output thread")?;
 
diff --git a/crates/lumen-host/src/vdisplay/mutter.rs b/crates/punktfunk-host/src/vdisplay/mutter.rs
similarity index 98%
rename from crates/lumen-host/src/vdisplay/mutter.rs
rename to crates/punktfunk-host/src/vdisplay/mutter.rs
index f6473ac2..c899f174 100644
--- a/crates/lumen-host/src/vdisplay/mutter.rs
+++ b/crates/punktfunk-host/src/vdisplay/mutter.rs
@@ -16,7 +16,7 @@
 //!
 //! Requires a running Mutter (`gnome-shell` session, or `gnome-shell --headless` for the
 //! headless host) on the session bus. GNOME is detected via `XDG_CURRENT_DESKTOP=GNOME` or
-//! forced with `LUMEN_COMPOSITOR=mutter`.
+//! forced with `PUNKTFUNK_COMPOSITOR=mutter`.
 
 use super::{Mode, VirtualDisplay, VirtualOutput};
 use anyhow::{anyhow, bail, Context, Result};
@@ -56,7 +56,7 @@ impl VirtualDisplay for MutterDisplay {
         let stop = Arc::new(AtomicBool::new(false));
         let stop_thread = stop.clone();
         thread::Builder::new()
-            .name("lumen-mutter-vout".into())
+            .name("punktfunk-mutter-vout".into())
             .spawn(move || session_thread(setup_tx, stop_thread))
             .context("spawn Mutter virtual-output thread")?;
 
diff --git a/crates/lumen-host/src/zerocopy/cuda.rs b/crates/punktfunk-host/src/zerocopy/cuda.rs
similarity index 100%
rename from crates/lumen-host/src/zerocopy/cuda.rs
rename to crates/punktfunk-host/src/zerocopy/cuda.rs
diff --git a/crates/lumen-host/src/zerocopy/egl.rs b/crates/punktfunk-host/src/zerocopy/egl.rs
similarity index 100%
rename from crates/lumen-host/src/zerocopy/egl.rs
rename to crates/punktfunk-host/src/zerocopy/egl.rs
diff --git a/crates/lumen-host/src/zerocopy/mod.rs b/crates/punktfunk-host/src/zerocopy/mod.rs
similarity index 90%
rename from crates/lumen-host/src/zerocopy/mod.rs
rename to crates/punktfunk-host/src/zerocopy/mod.rs
index b8d9aed7..0f6a81f5 100644
--- a/crates/lumen-host/src/zerocopy/mod.rs
+++ b/crates/punktfunk-host/src/zerocopy/mod.rs
@@ -1,6 +1,6 @@
 //! Zero-copy capture→encode (plan §9): the PipeWire dmabuf is imported into CUDA via EGL and
 //! handed straight to NVENC, eliminating the per-frame CPU copies (at 5K the CPU-copy path
-//! moves ~3.5 GB/s). Opt in with `LUMEN_ZEROCOPY=1`; the CPU-copy path stays the default and
+//! moves ~3.5 GB/s). Opt in with `PUNKTFUNK_ZEROCOPY=1`; the CPU-copy path stays the default and
 //! the runtime fallback (foreign-allocator / no-dmabuf / import failure).
 //!
 //! Pieces: [`cuda`] (driver-API FFI + the shared `CUcontext` + device buffers), [`egl`] (the
@@ -14,9 +14,9 @@ pub mod vulkan;
 pub use cuda::DeviceBuffer;
 pub use egl::{DmabufPlane, EglImporter};
 
-/// Whether the zero-copy path is opted in (`LUMEN_ZEROCOPY` truthy).
+/// Whether the zero-copy path is opted in (`PUNKTFUNK_ZEROCOPY` truthy).
 pub fn enabled() -> bool {
-    std::env::var("LUMEN_ZEROCOPY")
+    std::env::var("PUNKTFUNK_ZEROCOPY")
         .map(|v| matches!(v.trim(), "1" | "true" | "yes" | "on"))
         .unwrap_or(false)
 }
diff --git a/crates/lumen-host/src/zerocopy/vulkan.rs b/crates/punktfunk-host/src/zerocopy/vulkan.rs
similarity index 100%
rename from crates/lumen-host/src/zerocopy/vulkan.rs
rename to crates/punktfunk-host/src/zerocopy/vulkan.rs
diff --git a/include/lumen_core.h b/include/punktfunk_core.h
similarity index 53%
rename from include/lumen_core.h
rename to include/punktfunk_core.h
index b8a5f4c9..96a6c371 100644
--- a/include/lumen_core.h
+++ b/include/punktfunk_core.h
@@ -1,11 +1,11 @@
-/* lumen-core C ABI — see crates/lumen-core/src/abi.rs */
+/* punktfunk-core C ABI — see crates/punktfunk-core/src/abi.rs */
 
-#ifndef LUMEN_CORE_H
-#define LUMEN_CORE_H
+#ifndef PUNKTFUNK_CORE_H
+#define PUNKTFUNK_CORE_H
 
 #pragma once
 
-/* Generated by cbindgen from lumen-core. Do not edit by hand. */
+/* Generated by cbindgen from punktfunk-core. Do not edit by hand. */
 
 #include <stdarg.h>
 #include <stdbool.h>
@@ -13,7 +13,7 @@
 #include <stdlib.h>
 
 // Bump on any breaking change to the [C ABI](crate::abi). Mirrors
-// `lumen_abi_version()` and is checked by clients before use.
+// `punktfunk_abi_version()` and is checked by clients before use.
 #define ABI_VERSION 1
 
 // 16-byte AEAD authentication tag appended by GCM.
@@ -25,52 +25,52 @@
 // Fixed serialized size of an [`InputEvent`] on the wire (tag + fields).
 #define INPUT_WIRE_LEN (((((1 + 1) + 4) + 4) + 4) + 4)
 
-#define LUMEN_BTN_DPAD_UP 1
+#define PUNKTFUNK_BTN_DPAD_UP 1
 
-#define LUMEN_BTN_DPAD_DOWN 2
+#define PUNKTFUNK_BTN_DPAD_DOWN 2
 
-#define LUMEN_BTN_DPAD_LEFT 4
+#define PUNKTFUNK_BTN_DPAD_LEFT 4
 
-#define LUMEN_BTN_DPAD_RIGHT 8
+#define PUNKTFUNK_BTN_DPAD_RIGHT 8
 
-#define LUMEN_BTN_START 16
+#define PUNKTFUNK_BTN_START 16
 
-#define LUMEN_BTN_BACK 32
+#define PUNKTFUNK_BTN_BACK 32
 
-#define LUMEN_BTN_LS_CLICK 64
+#define PUNKTFUNK_BTN_LS_CLICK 64
 
-#define LUMEN_BTN_RS_CLICK 128
+#define PUNKTFUNK_BTN_RS_CLICK 128
 
-#define LUMEN_BTN_LB 256
+#define PUNKTFUNK_BTN_LB 256
 
-#define LUMEN_BTN_RB 512
+#define PUNKTFUNK_BTN_RB 512
 
-#define LUMEN_BTN_GUIDE 1024
+#define PUNKTFUNK_BTN_GUIDE 1024
 
-#define LUMEN_BTN_A 4096
+#define PUNKTFUNK_BTN_A 4096
 
-#define LUMEN_BTN_B 8192
+#define PUNKTFUNK_BTN_B 8192
 
-#define LUMEN_BTN_X 16384
+#define PUNKTFUNK_BTN_X 16384
 
-#define LUMEN_BTN_Y 32768
+#define PUNKTFUNK_BTN_Y 32768
 
 // Axis ids for `InputKind::GamepadAxis`.
-#define LUMEN_AXIS_LS_X 0
+#define PUNKTFUNK_AXIS_LS_X 0
 
-#define LUMEN_AXIS_LS_Y 1
+#define PUNKTFUNK_AXIS_LS_Y 1
 
-#define LUMEN_AXIS_RS_X 2
+#define PUNKTFUNK_AXIS_RS_X 2
 
-#define LUMEN_AXIS_RS_Y 3
+#define PUNKTFUNK_AXIS_RS_Y 3
 
 // Triggers: value range 0..255.
-#define LUMEN_AXIS_LT 4
+#define PUNKTFUNK_AXIS_LT 4
 
-#define LUMEN_AXIS_RT 5
+#define PUNKTFUNK_AXIS_RT 5
 
-// Identifies a lumen video packet (vs. an input datagram, see [`crate::input`]).
-#define LUMEN_MAGIC 201
+// Identifies a punktfunk video packet (vs. an input datagram, see [`crate::input`]).
+#define PUNKTFUNK_MAGIC 201
 
 #define FLAG_PIC 1
 
@@ -82,97 +82,97 @@
 // `shard_payload` so `HEADER_LEN + shard_payload + CRYPTO_OVERHEAD ≤ MAX_DATAGRAM_BYTES`.
 #define MAX_DATAGRAM_BYTES 2048
 
-#if defined(LUMEN_FEATURE_QUIC)
+#if defined(PUNKTFUNK_FEATURE_QUIC)
 // Datagram wire tags. Video rides UDP; everything low-rate rides QUIC datagrams,
 // demultiplexed by the first byte: input = [`crate::input::INPUT_MAGIC`] (0xC8),
 // audio = [`AUDIO_MAGIC`], rumble = [`RUMBLE_MAGIC`].
-#define LUMEN_AUDIO_MAGIC 201
+#define PUNKTFUNK_AUDIO_MAGIC 201
 #endif
 
-#if defined(LUMEN_FEATURE_QUIC)
-#define LUMEN_RUMBLE_MAGIC 202
+#if defined(PUNKTFUNK_FEATURE_QUIC)
+#define PUNKTFUNK_RUMBLE_MAGIC 202
 #endif
 
 // Stable C ABI status codes. `Ok` is 0; all errors are negative so callers can
 // test `rc < 0`. Do not renumber existing variants — only append.
-enum LumenStatus
+enum PunktfunkStatus
 #if defined(__cplusplus) || __STDC_VERSION__ >= 202311L
   : int32_t
 #endif // defined(__cplusplus) || __STDC_VERSION__ >= 202311L
  {
-    LUMEN_STATUS_OK = 0,
-    LUMEN_STATUS_INVALID_ARG = -1,
-    LUMEN_STATUS_FEC = -2,
-    LUMEN_STATUS_CRYPTO = -3,
-    LUMEN_STATUS_BAD_PACKET = -4,
-    LUMEN_STATUS_NO_FRAME = -5,
-    LUMEN_STATUS_UNSUPPORTED = -6,
-    LUMEN_STATUS_IO = -7,
-    LUMEN_STATUS_NULL_POINTER = -8,
-    LUMEN_STATUS_TIMEOUT = -9,
-    LUMEN_STATUS_CLOSED = -10,
-    LUMEN_STATUS_PANIC = -99,
+    PUNKTFUNK_STATUS_OK = 0,
+    PUNKTFUNK_STATUS_INVALID_ARG = -1,
+    PUNKTFUNK_STATUS_FEC = -2,
+    PUNKTFUNK_STATUS_CRYPTO = -3,
+    PUNKTFUNK_STATUS_BAD_PACKET = -4,
+    PUNKTFUNK_STATUS_NO_FRAME = -5,
+    PUNKTFUNK_STATUS_UNSUPPORTED = -6,
+    PUNKTFUNK_STATUS_IO = -7,
+    PUNKTFUNK_STATUS_NULL_POINTER = -8,
+    PUNKTFUNK_STATUS_TIMEOUT = -9,
+    PUNKTFUNK_STATUS_CLOSED = -10,
+    PUNKTFUNK_STATUS_PANIC = -99,
 };
 #ifndef __cplusplus
 #if __STDC_VERSION__ >= 202311L
-typedef enum LumenStatus LumenStatus;
+typedef enum PunktfunkStatus PunktfunkStatus;
 #else
-typedef int32_t LumenStatus;
+typedef int32_t PunktfunkStatus;
 #endif // __STDC_VERSION__ >= 202311L
 #endif // __cplusplus
 
 // Kinds of input event. `#[repr(u8)]` so it crosses the C ABI as a byte tag.
-enum LumenInputKind
+enum PunktfunkInputKind
 #if defined(__cplusplus) || __STDC_VERSION__ >= 202311L
   : uint8_t
 #endif // defined(__cplusplus) || __STDC_VERSION__ >= 202311L
  {
-    LUMEN_INPUT_KIND_KEY_DOWN = 0,
-    LUMEN_INPUT_KIND_KEY_UP = 1,
+    PUNKTFUNK_INPUT_KIND_KEY_DOWN = 0,
+    PUNKTFUNK_INPUT_KIND_KEY_UP = 1,
     // Relative motion: `x`/`y` carry `dx`/`dy`.
-    LUMEN_INPUT_KIND_MOUSE_MOVE = 2,
+    PUNKTFUNK_INPUT_KIND_MOUSE_MOVE = 2,
     // Absolute motion: `x`/`y` carry pixel coordinates.
-    LUMEN_INPUT_KIND_MOUSE_MOVE_ABS = 3,
-    LUMEN_INPUT_KIND_MOUSE_BUTTON_DOWN = 4,
-    LUMEN_INPUT_KIND_MOUSE_BUTTON_UP = 5,
+    PUNKTFUNK_INPUT_KIND_MOUSE_MOVE_ABS = 3,
+    PUNKTFUNK_INPUT_KIND_MOUSE_BUTTON_DOWN = 4,
+    PUNKTFUNK_INPUT_KIND_MOUSE_BUTTON_UP = 5,
     // `x` carries the (signed) scroll delta.
-    LUMEN_INPUT_KIND_MOUSE_SCROLL = 6,
+    PUNKTFUNK_INPUT_KIND_MOUSE_SCROLL = 6,
     // `code` = button bit ([`gamepad`] `BTN_*`), `x` ≠ 0 = pressed, `flags` = pad index.
-    LUMEN_INPUT_KIND_GAMEPAD_BUTTON = 7,
+    PUNKTFUNK_INPUT_KIND_GAMEPAD_BUTTON = 7,
     // `code` = axis id ([`gamepad`] `AXIS_*`), `x` = axis value, `flags` = pad index.
     // Sticks are i16 range (−32768..32767) in the XInput/Moonlight convention — **+y =
     // up** (unlike mouse coordinates); triggers 0..255.
-    LUMEN_INPUT_KIND_GAMEPAD_AXIS = 8,
+    PUNKTFUNK_INPUT_KIND_GAMEPAD_AXIS = 8,
 };
 #ifndef __cplusplus
 #if __STDC_VERSION__ >= 202311L
-typedef enum LumenInputKind LumenInputKind;
+typedef enum PunktfunkInputKind PunktfunkInputKind;
 #else
-typedef uint8_t LumenInputKind;
+typedef uint8_t PunktfunkInputKind;
 #endif // __STDC_VERSION__ >= 202311L
 #endif // __cplusplus
 
-#if defined(LUMEN_FEATURE_QUIC)
-// Opaque handle to a live `lumen/1` connection (QUIC control plane + UDP data plane, all
+#if defined(PUNKTFUNK_FEATURE_QUIC)
+// Opaque handle to a live `punktfunk/1` connection (QUIC control plane + UDP data plane, all
 // pumped on internal threads).
 //
 // Thread contract: each plane (video `next_au`, audio `next_audio`, rumble `next_rumble`)
 // may be pulled from its own thread, at most one thread per plane. The accessors only
 // take shared references internally (per-plane mutexed borrow slots), so cross-plane
 // concurrency is sound — never two threads on the *same* plane.
-typedef struct LumenConnection LumenConnection;
+typedef struct PunktfunkConnection PunktfunkConnection;
 #endif
 
 // Opaque session handle. Pointer-only from C.
-typedef struct LumenSession LumenSession;
+typedef struct PunktfunkSession PunktfunkSession;
 
 // Forward-compatible session configuration. The caller MUST set `struct_size` to
-// `sizeof(LumenConfig)`; the core uses it to detect ABI skew.
+// `sizeof(PunktfunkConfig)`; the core uses it to detect ABI skew.
 typedef struct {
     uint32_t struct_size;
     // 0 = host, 1 = client.
     uint32_t role;
-    // 1 = P1 (GameStream-compatible), 2 = P2 (`lumen/1`).
+    // 1 = P1 (GameStream-compatible), 2 = P2 (`punktfunk/1`).
     uint32_t phase;
     // 0 = GF(2⁸), 1 = GF(2¹⁶).
     uint32_t fec_scheme;
@@ -187,22 +187,22 @@ typedef struct {
     uint32_t loopback_drop_period;
     // Largest encoded access unit the receiver will accept (bounds reassembler memory).
     uint64_t max_frame_bytes;
-} LumenConfig;
+} PunktfunkConfig;
 
 // A reassembled access unit. `data`/`len` borrow session-owned memory valid until the
-// next `lumen_client_poll_frame`/`lumen_session_free` on the same session.
+// next `punktfunk_client_poll_frame`/`punktfunk_session_free` on the same session.
 typedef struct {
     const uint8_t *data;
     uintptr_t len;
     uint32_t frame_index;
     uint64_t pts_ns;
     uint32_t flags;
-} LumenFrame;
+} PunktfunkFrame;
 
 // A single input event. `#[repr(C)]` — shared verbatim with the C ABI as
-// `LumenInputEvent`.
+// `PunktfunkInputEvent`.
 typedef struct {
-    LumenInputKind kind;
+    PunktfunkInputKind kind;
     uint8_t _pad[3];
     // keycode / button id / axis id, depending on `kind`.
     uint32_t code;
@@ -212,7 +212,7 @@ typedef struct {
     int32_t y;
     // modifier bitmask or gamepad index.
     uint32_t flags;
-} LumenInputEvent;
+} PunktfunkInputEvent;
 
 // Snapshot of session counters.
 typedef struct {
@@ -225,17 +225,17 @@ typedef struct {
     uint64_t fec_recovered_shards;
     uint64_t bytes_sent;
     uint64_t bytes_received;
-} LumenStats;
+} PunktfunkStats;
 
-#if defined(LUMEN_FEATURE_QUIC)
-// One Opus audio packet pulled off a `lumen/1` connection (48 kHz stereo, 5 ms frames).
-// `data` borrows connection memory until the next `lumen_connection_next_audio` call.
+#if defined(PUNKTFUNK_FEATURE_QUIC)
+// One Opus audio packet pulled off a `punktfunk/1` connection (48 kHz stereo, 5 ms frames).
+// `data` borrows connection memory until the next `punktfunk_connection_next_audio` call.
 typedef struct {
     const uint8_t *data;
     uintptr_t len;
     uint32_t seq;
     uint64_t pts_ns;
-} LumenAudioPacket;
+} PunktfunkAudioPacket;
 #endif
 
 #ifdef __cplusplus
@@ -243,77 +243,80 @@ extern "C" {
 #endif // __cplusplus
 
 // Current ABI version. Mismatch with [`crate::ABI_VERSION`] means incompatible core.
-uint32_t lumen_abi_version(void);
+uint32_t punktfunk_abi_version(void);
 
 // Create a session over a real UDP transport (`local`/`peer` are `host:port` strings).
 // Returns NULL on error.
 //
 // # Safety
 // `cfg`, `local`, `peer` must be valid pointers; the strings must be NUL-terminated.
-LumenSession *lumen_session_new(const LumenConfig *cfg, const char *local, const char *peer);
+PunktfunkSession *punktfunk_session_new(const PunktfunkConfig *cfg,
+                                        const char *local,
+                                        const char *peer);
 
 // Create a connected host+client session pair sharing an in-process loopback
 // transport. Test/dev only — exercises the full FEC + framing path without a network.
 //
 // # Safety
 // All four pointers must be valid; the two out-params receive owned handles.
-LumenStatus lumen_test_loopback_pair(const LumenConfig *host_cfg,
-                                     const LumenConfig *client_cfg,
-                                     LumenSession **out_host,
-                                     LumenSession **out_client);
+PunktfunkStatus punktfunk_test_loopback_pair(const PunktfunkConfig *host_cfg,
+                                             const PunktfunkConfig *client_cfg,
+                                             PunktfunkSession **out_host,
+                                             PunktfunkSession **out_client);
 
 // Free a session handle. Safe to call with NULL.
 //
 // # Safety
-// `s` must be a handle from `lumen_session_new`/`lumen_test_loopback_pair`, freed once.
-void lumen_session_free(LumenSession *s);
+// `s` must be a handle from `punktfunk_session_new`/`punktfunk_test_loopback_pair`, freed once.
+void punktfunk_session_free(PunktfunkSession *s);
 
 // Host: FEC-protect, packetize, seal and send one encoded access unit.
 //
 // # Safety
 // `s` is a valid host handle; `data` points to `len` readable bytes (or `len == 0`).
-LumenStatus lumen_host_submit_frame(LumenSession *s,
-                                    const uint8_t *data,
-                                    uintptr_t len,
-                                    uint64_t pts_ns,
-                                    uint32_t flags);
+PunktfunkStatus punktfunk_host_submit_frame(PunktfunkSession *s,
+                                            const uint8_t *data,
+                                            uintptr_t len,
+                                            uint64_t pts_ns,
+                                            uint32_t flags);
 
-// Client: poll for the next reassembled access unit. Returns [`LumenStatus::NoFrame`]
+// Client: poll for the next reassembled access unit. Returns [`PunktfunkStatus::NoFrame`]
 // when nothing is ready yet. On `Ok`, `*out` borrows session memory until the next poll.
 //
 // # Safety
-// `s` is a valid client handle; `out` points to a writable `LumenFrame`.
-LumenStatus lumen_client_poll_frame(LumenSession *s, LumenFrame *out);
+// `s` is a valid client handle; `out` points to a writable `PunktfunkFrame`.
+PunktfunkStatus punktfunk_client_poll_frame(PunktfunkSession *s, PunktfunkFrame *out);
 
 // Client: serialize and send one input event to the host.
 //
 // # Safety
 // `s` is a valid client handle; `ev` points to a valid [`InputEvent`].
-LumenStatus lumen_send_input(LumenSession *s, const LumenInputEvent *ev);
+PunktfunkStatus punktfunk_send_input(PunktfunkSession *s, const PunktfunkInputEvent *ev);
 
 // Register the host-side input callback (pass a NULL fn pointer to clear). The callback
-// fires from within [`lumen_host_poll_input`], on the calling thread.
+// fires from within [`punktfunk_host_poll_input`], on the calling thread.
 //
 // # Safety
 // `s` is a valid host handle; `user` is passed back verbatim to `cb`.
-LumenStatus lumen_set_input_callback(LumenSession *s, void (*cb)(const LumenInputEvent *event,
-                                                                 void *user), void *user);
+PunktfunkStatus punktfunk_set_input_callback(PunktfunkSession *s,
+                                             void (*cb)(const PunktfunkInputEvent *event, void *user),
+                                             void *user);
 
 // Host: drain all pending input events, invoking the registered callback for each.
-// Returns the count dispatched (≥ 0), or a negative [`LumenStatus`] on error.
+// Returns the count dispatched (≥ 0), or a negative [`PunktfunkStatus`] on error.
 //
 // # Safety
 // `s` is a valid host handle.
-int32_t lumen_host_poll_input(LumenSession *s);
+int32_t punktfunk_host_poll_input(PunktfunkSession *s);
 
 // Copy session counters into `*out`.
 //
 // # Safety
-// `s` is a valid handle; `out` points to a writable `LumenStats`.
-LumenStatus lumen_get_stats(LumenSession *s, LumenStats *out);
+// `s` is a valid handle; `out` points to a writable `PunktfunkStats`.
+PunktfunkStatus punktfunk_get_stats(PunktfunkSession *s, PunktfunkStats *out);
 
-#if defined(LUMEN_FEATURE_QUIC)
-// Connect to a `lumen/1` host and start a session at `width`x`height`@`refresh_hz`.
+#if defined(PUNKTFUNK_FEATURE_QUIC)
+// Connect to a `punktfunk/1` host and start a session at `width`x`height`@`refresh_hz`.
 // Blocks up to `timeout_ms` for the handshake. Returns NULL on failure.
 //
 // Trust: `pin_sha256` (NULL or 32 bytes) is the expected SHA-256 fingerprint of the host's
@@ -324,31 +327,33 @@ LumenStatus lumen_get_stats(LumenSession *s, LumenStats *out);
 // # Safety
 // `host` is a NUL-terminated UTF-8 string (IP or hostname resolvable by the platform);
 // `pin_sha256`/`observed_sha256_out` are each NULL or valid for 32 bytes.
-LumenConnection *lumen_connect(const char *host,
-                               uint16_t port,
-                               uint32_t width,
-                               uint32_t height,
-                               uint32_t refresh_hz,
-                               const uint8_t *pin_sha256,
-                               uint8_t *observed_sha256_out,
-                               uint32_t timeout_ms);
+PunktfunkConnection *punktfunk_connect(const char *host,
+                                       uint16_t port,
+                                       uint32_t width,
+                                       uint32_t height,
+                                       uint32_t refresh_hz,
+                                       const uint8_t *pin_sha256,
+                                       uint8_t *observed_sha256_out,
+                                       uint32_t timeout_ms);
 #endif
 
-#if defined(LUMEN_FEATURE_QUIC)
+#if defined(PUNKTFUNK_FEATURE_QUIC)
 // Pull the next reassembled access unit, waiting up to `timeout_ms`. Returns
-// [`LumenStatus::NoFrame`] on timeout and [`LumenStatus::Closed`] once the session ended.
+// [`PunktfunkStatus::NoFrame`] on timeout and [`PunktfunkStatus::Closed`] once the session ended.
 // On `Ok`, `*out` borrows connection memory **until the next `next_au` call** on this
 // handle (the audio/rumble planes do not invalidate it).
 //
 // # Safety
 // `c` is a valid connection handle; `out` is writable. At most one thread pulls video —
 // it may run concurrently with one audio-pulling and one rumble-pulling thread.
-LumenStatus lumen_connection_next_au(LumenConnection *c, LumenFrame *out, uint32_t timeout_ms);
+PunktfunkStatus punktfunk_connection_next_au(PunktfunkConnection *c,
+                                             PunktfunkFrame *out,
+                                             uint32_t timeout_ms);
 #endif
 
-#if defined(LUMEN_FEATURE_QUIC)
+#if defined(PUNKTFUNK_FEATURE_QUIC)
 // Pull the next Opus audio packet, waiting up to `timeout_ms`. Returns
-// [`LumenStatus::NoFrame`] on timeout and [`LumenStatus::Closed`] once the session ended.
+// [`PunktfunkStatus::NoFrame`] on timeout and [`PunktfunkStatus::Closed`] once the session ended.
 // On `Ok`, `out->data` borrows connection memory **until the next audio call** on this
 // handle (independent of the video slot). Drain from a dedicated audio thread — packets
 // arrive every 5 ms and the internal queue holds 320 ms.
@@ -356,55 +361,56 @@ LumenStatus lumen_connection_next_au(LumenConnection *c, LumenFrame *out, uint32
 // # Safety
 // `c` is a valid connection handle; `out` is writable. At most one thread pulls audio —
 // it may run concurrently with the video/rumble pullers.
-LumenStatus lumen_connection_next_audio(LumenConnection *c,
-                                        LumenAudioPacket *out,
-                                        uint32_t timeout_ms);
+PunktfunkStatus punktfunk_connection_next_audio(PunktfunkConnection *c,
+                                                PunktfunkAudioPacket *out,
+                                                uint32_t timeout_ms);
 #endif
 
-#if defined(LUMEN_FEATURE_QUIC)
+#if defined(PUNKTFUNK_FEATURE_QUIC)
 // Pull the next rumble (force-feedback) update, waiting up to `timeout_ms`. Amplitudes
 // are 0..0xFFFF (`low` = low-frequency motor, `high` = high-frequency), `(0, 0)` = stop.
-// Same timeout/closed semantics as [`lumen_connection_next_audio`].
+// Same timeout/closed semantics as [`punktfunk_connection_next_audio`].
 //
 // # Safety
 // `c` is a valid connection handle; out pointers are writable (NULLs are skipped). At
 // most one thread pulls rumble — it may run concurrently with the video/audio pullers.
-LumenStatus lumen_connection_next_rumble(LumenConnection *c,
-                                         uint16_t *pad,
-                                         uint16_t *low,
-                                         uint16_t *high,
-                                         uint32_t timeout_ms);
+PunktfunkStatus punktfunk_connection_next_rumble(PunktfunkConnection *c,
+                                                 uint16_t *pad,
+                                                 uint16_t *low,
+                                                 uint16_t *high,
+                                                 uint32_t timeout_ms);
 #endif
 
-#if defined(LUMEN_FEATURE_QUIC)
+#if defined(PUNKTFUNK_FEATURE_QUIC)
 // Send one input event to the host as a QUIC datagram (non-blocking enqueue).
 //
 // # Safety
 // `c` is a valid connection handle; `ev` points to a valid [`InputEvent`].
-LumenStatus lumen_connection_send_input(LumenConnection *c, const LumenInputEvent *ev);
+PunktfunkStatus punktfunk_connection_send_input(PunktfunkConnection *c,
+                                                const PunktfunkInputEvent *ev);
 #endif
 
-#if defined(LUMEN_FEATURE_QUIC)
+#if defined(PUNKTFUNK_FEATURE_QUIC)
 // The host-confirmed session mode (from the Welcome). Safe any time after connect.
 //
 // # Safety
 // `c` is a valid connection handle; out pointers are writable (NULLs are skipped).
-LumenStatus lumen_connection_mode(const LumenConnection *c,
-                                  uint32_t *width,
-                                  uint32_t *height,
-                                  uint32_t *refresh_hz);
+PunktfunkStatus punktfunk_connection_mode(const PunktfunkConnection *c,
+                                          uint32_t *width,
+                                          uint32_t *height,
+                                          uint32_t *refresh_hz);
 #endif
 
-#if defined(LUMEN_FEATURE_QUIC)
+#if defined(PUNKTFUNK_FEATURE_QUIC)
 // Close the connection and free the handle (joins the internal threads). NULL is a no-op.
 //
 // # Safety
-// `c` was returned by [`lumen_connect`] and is not used after this call.
-void lumen_connection_close(LumenConnection *c);
+// `c` was returned by [`punktfunk_connect`] and is not used after this call.
+void punktfunk_connection_close(PunktfunkConnection *c);
 #endif
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif  // __cplusplus
 
-#endif  /* LUMEN_CORE_H */
+#endif  /* PUNKTFUNK_CORE_H */
diff --git a/scripts/60-lumen.rules b/scripts/60-punktfunk.rules
similarity index 76%
rename from scripts/60-lumen.rules
rename to scripts/60-punktfunk.rules
index d68b4b7b..ca99b527 100644
--- a/scripts/60-lumen.rules
+++ b/scripts/60-punktfunk.rules
@@ -1,11 +1,11 @@
-# udev rules for the lumen streaming host (mirrors Sunshine's 60-sunshine.rules).
+# udev rules for the punktfunk streaming host (mirrors Sunshine's 60-sunshine.rules).
 #
 # Grants the `input` group access to /dev/uinput so the host can create virtual gamepads
 # (one X-Box-360-class pad per connected Moonlight controller). `static_node` makes the node
 # exist before the uinput module loads.
 #
 # Install:
-#   sudo cp scripts/60-lumen.rules /etc/udev/rules.d/
+#   sudo cp scripts/60-punktfunk.rules /etc/udev/rules.d/
 #   sudo usermod -aG input $USER       # then re-login (or reboot)
 #   sudo udevadm control --reload-rules && sudo udevadm trigger
 KERNEL=="uinput", SUBSYSTEM=="misc", OPTIONS+="static_node=uinput", GROUP="input", MODE="0660", TAG+="uaccess"
diff --git a/scripts/bootstrap-ubuntu.sh b/scripts/bootstrap-ubuntu.sh
index 31116006..8951ad01 100755
--- a/scripts/bootstrap-ubuntu.sh
+++ b/scripts/bootstrap-ubuntu.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Bootstrap an Ubuntu (24.04 "noble") NVIDIA-GPU VM to build/run the lumen Linux host
+# Bootstrap an Ubuntu (24.04 "noble") NVIDIA-GPU VM to build/run the punktfunk Linux host
 # and the M0 capture spike (headless Sway/wlroots -> PipeWire -> NVENC).
 #
 # Assumes the NVIDIA driver + an FFmpeg-with-NVENC are ALREADY installed (verify-only).
@@ -57,10 +57,10 @@ if have ffmpeg; then
         ok "FFmpeg has NVENC: $(ffmpeg -hide_banner -encoders 2>/dev/null | grep -oE '(hevc|h264)_nvenc' | paste -sd' ' -)"
         log "  smoke-test: 1s HEVC NVENC encode to null"
         if ffmpeg -hide_banner -loglevel error -f lavfi -i color=c=black:s=1280x720:d=1 \
-               -c:v hevc_nvenc -preset p1 -tune ull -f null - 2>/tmp/lumen_nvenc.err; then
+               -c:v hevc_nvenc -preset p1 -tune ull -f null - 2>/tmp/punktfunk_nvenc.err; then
             ok "hevc_nvenc encode succeeded — NVENC is usable in this guest"
         else
-            warn "hevc_nvenc encode FAILED (see /tmp/lumen_nvenc.err). Common cause on a VM: \
+            warn "hevc_nvenc encode FAILED (see /tmp/punktfunk_nvenc.err). Common cause on a VM: \
 missing libnvidia-encode.so.1 or an unlicensed vGPU."
         fi
     else
diff --git a/scripts/build-xcframework.sh b/scripts/build-xcframework.sh
index fef7eb06..8dff1afd 100644
--- a/scripts/build-xcframework.sh
+++ b/scripts/build-xcframework.sh
@@ -1,12 +1,12 @@
 #!/usr/bin/env bash
-# Build LumenCore.xcframework for the Apple clients — run ON A MAC with Xcode + rustup.
+# Build PunktfunkCore.xcframework for the Apple clients — run ON A MAC with Xcode + rustup.
 #
 #   rustup target add aarch64-apple-darwin x86_64-apple-darwin   # + aarch64-apple-ios for iOS
 #   bash scripts/build-xcframework.sh
 #
-# Output: clients/apple/LumenCore.xcframework (consumed by clients/apple/Package.swift).
-# The library is built WITH the `quic` feature (the lumen/1 connection API), so the bundled
-# header gets LUMEN_FEATURE_QUIC pre-defined — Swift sees lumen_connect & co. unconditionally.
+# Output: clients/apple/PunktfunkCore.xcframework (consumed by clients/apple/Package.swift).
+# The library is built WITH the `quic` feature (the punktfunk/1 connection API), so the bundled
+# header gets PUNKTFUNK_FEATURE_QUIC pre-defined — Swift sees punktfunk_connect & co. unconditionally.
 set -euo pipefail
 cd "$(dirname "$0")/.."
 
@@ -16,10 +16,10 @@ BUILD_IOS="${BUILD_IOS:-0}" # BUILD_IOS=1 adds an iOS slice (requires the ios ta
 # Deployment targets must match Package.swift's platforms, or every consumer link emits
 # "object file was built for newer macOS version" warnings.
 for t in "${TARGETS_MAC[@]}"; do
-    MACOSX_DEPLOYMENT_TARGET=14.0 cargo build --release -p lumen-core --features quic --target "$t"
+    MACOSX_DEPLOYMENT_TARGET=14.0 cargo build --release -p punktfunk-core --features quic --target "$t"
 done
 if [[ "$BUILD_IOS" == "1" ]]; then
-    IPHONEOS_DEPLOYMENT_TARGET=17.0 cargo build --release -p lumen-core --features quic --target aarch64-apple-ios
+    IPHONEOS_DEPLOYMENT_TARGET=17.0 cargo build --release -p punktfunk-core --features quic --target aarch64-apple-ios
 fi
 
 STAGE="$(mktemp -d)"
@@ -28,33 +28,33 @@ trap 'rm -rf "$STAGE"' EXIT
 # Universal macOS static lib.
 mkdir -p "$STAGE/macos"
 lipo -create \
-    target/aarch64-apple-darwin/release/liblumen_core.a \
-    target/x86_64-apple-darwin/release/liblumen_core.a \
-    -output "$STAGE/macos/liblumen_core.a"
+    target/aarch64-apple-darwin/release/libpunktfunk_core.a \
+    target/x86_64-apple-darwin/release/libpunktfunk_core.a \
+    -output "$STAGE/macos/libpunktfunk_core.a"
 
 # Headers dir: the generated C header (with the quic API force-enabled) + a modulemap so
-# Swift can `import LumenCore`.
+# Swift can `import PunktfunkCore`.
 mkdir -p "$STAGE/include"
 {
-    echo "#define LUMEN_FEATURE_QUIC 1"
-    cat include/lumen_core.h
-} > "$STAGE/include/lumen_core.h"
+    echo "#define PUNKTFUNK_FEATURE_QUIC 1"
+    cat include/punktfunk_core.h
+} > "$STAGE/include/punktfunk_core.h"
 cat > "$STAGE/include/module.modulemap" <<'EOF'
-module LumenCore {
-    header "lumen_core.h"
+module PunktfunkCore {
+    header "punktfunk_core.h"
     export *
 }
 EOF
 
-ARGS=(-library "$STAGE/macos/liblumen_core.a" -headers "$STAGE/include")
+ARGS=(-library "$STAGE/macos/libpunktfunk_core.a" -headers "$STAGE/include")
 if [[ "$BUILD_IOS" == "1" ]]; then
-    ARGS+=(-library target/aarch64-apple-ios/release/liblumen_core.a -headers "$STAGE/include")
+    ARGS+=(-library target/aarch64-apple-ios/release/libpunktfunk_core.a -headers "$STAGE/include")
 fi
 
 # Cargo does NOT fingerprint MACOSX_DEPLOYMENT_TARGET — units cached from a build without
 # it keep their old minos forever. Refuse to ship anything newer than the package floor
 # (objects BELOW it, e.g. rustup's precompiled std at 11.0, are fine and unavoidable).
-for obj in "$STAGE"/macos/liblumen_core.a; do
+for obj in "$STAGE"/macos/libpunktfunk_core.a; do
     bad=$(otool -l "$obj" 2>/dev/null | awk '/minos/ {print $2}' | sort -uV | awk -F. '$1 > 14' | head -1)
     if [[ -n "$bad" ]]; then
         echo "ERROR: $obj contains objects built for macOS $bad (> 14.0)." >&2
@@ -63,6 +63,6 @@ for obj in "$STAGE"/macos/liblumen_core.a; do
     fi
 done
 
-rm -rf clients/apple/LumenCore.xcframework
-xcodebuild -create-xcframework "${ARGS[@]}" -output clients/apple/LumenCore.xcframework
-echo "OK: clients/apple/LumenCore.xcframework"
+rm -rf clients/apple/PunktfunkCore.xcframework
+xcodebuild -create-xcframework "${ARGS[@]}" -output clients/apple/PunktfunkCore.xcframework
+echo "OK: clients/apple/PunktfunkCore.xcframework"
diff --git a/scripts/headless/capture-smoke-test.sh b/scripts/headless/capture-smoke-test.sh
index 32fe8228..cb2839de 100755
--- a/scripts/headless/capture-smoke-test.sh
+++ b/scripts/headless/capture-smoke-test.sh
@@ -7,7 +7,7 @@
 #   Ctrl-C to stop; then play/inspect the file (e.g. ffprobe out.mkv).
 set -euo pipefail
 
-OUT="${1:-/tmp/lumen-headless-test.mkv}"
+OUT="${1:-/tmp/punktfunk-headless-test.mkv}"
 : "${WAYLAND_DISPLAY:?set WAYLAND_DISPLAY (e.g. wayland-1) — is headless Sway running?}"
 : "${XDG_RUNTIME_DIR:?set XDG_RUNTIME_DIR=/run/user/\$(id -u)}"
 
diff --git a/scripts/headless/env.sh b/scripts/headless/env.sh
index 36f33063..ba7a25cb 100644
--- a/scripts/headless/env.sh
+++ b/scripts/headless/env.sh
@@ -1,5 +1,5 @@
 # shellcheck shell=bash
-# Source before launching headless Sway / the lumen host on an NVIDIA VM:
+# Source before launching headless Sway / the punktfunk host on an NVIDIA VM:
 #   source scripts/headless/env.sh
 # These are the wlroots-on-NVIDIA workarounds the research turned up (gles2 is the
 # known-good renderer; Vulkan is flaky on the proprietary driver — try it only later).
diff --git a/scripts/headless/prepare-session.sh b/scripts/headless/prepare-session.sh
index 434c9a00..411a8e30 100755
--- a/scripts/headless/prepare-session.sh
+++ b/scripts/headless/prepare-session.sh
@@ -2,8 +2,8 @@
 # Run AFTER headless Sway is up (run-headless-sway.sh), from a second shell on the same
 # user. It: (1) points this shell at the running Sway, (2) gives HEADLESS-1 a real refresh
 # clock (an idle/0 mHz output produces no frames), (3) imports the env the ScreenCast portal
-# needs to find Sway and pick the wlr backend, and (4) writes /tmp/lumen-sway-env.sh so
-# other shells (e.g. `cargo run -p lumen-host`) can `source` it.
+# needs to find Sway and pick the wlr backend, and (4) writes /tmp/punktfunk-sway-env.sh so
+# other shells (e.g. `cargo run -p punktfunk-host`) can `source` it.
 #
 # Usage: bash scripts/headless/prepare-session.sh [WxH@RHz]   (default 1920x1080@60Hz)
 set -euo pipefail
@@ -32,7 +32,7 @@ echo "HEADLESS-1 set to $MODE"
 systemctl --user import-environment WAYLAND_DISPLAY XDG_CURRENT_DESKTOP SWAYSOCK XDG_RUNTIME_DIR 2>/dev/null || true
 dbus-update-activation-environment --systemd WAYLAND_DISPLAY XDG_CURRENT_DESKTOP SWAYSOCK 2>/dev/null || true
 
-cat > /tmp/lumen-sway-env.sh <<EOF
+cat > /tmp/punktfunk-sway-env.sh <<EOF
 export XDG_RUNTIME_DIR=$XDG_RUNTIME_DIR
 export WAYLAND_DISPLAY=$WAYLAND_DISPLAY
 export XDG_CURRENT_DESKTOP=sway
@@ -42,8 +42,8 @@ EOF
 
 cat <<EOF
 session ready. From any shell on this user:
-    source /tmp/lumen-sway-env.sh
+    source /tmp/punktfunk-sway-env.sh
     swaymsg exec foot          # optional: animated on-screen content
-    cargo run -p lumen-host -- m0 --source portal --seconds 5 --out /tmp/lumen-m0.h265
-    ffprobe /tmp/lumen-m0.h265
+    cargo run -p punktfunk-host -- m0 --source portal --seconds 5 --out /tmp/punktfunk-m0.h265
+    ffprobe /tmp/punktfunk-m0.h265
 EOF
diff --git a/scripts/headless/run-headless-kde.sh b/scripts/headless/run-headless-kde.sh
new file mode 100755
index 00000000..dcb3b946
--- /dev/null
+++ b/scripts/headless/run-headless-kde.sh
@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+# Headless KDE Plasma session for the punktfunk host (no KMS scanout → kwin --virtual).
+#
+# Brings up the full desktop, not just the compositor. The env matters: without
+# XDG_MENU_PREFIX=plasma- the launcher resolves ${XDG_MENU_PREFIX}applications.menu →
+# "applications.menu", which doesn't exist on KDE installs (it ships
+# plasma-applications.menu) — plasmashell runs fine but the menu shows NO applications
+# and no System Settings entry. kded6/krunner/kglobalacceld are D-Bus-activated once
+# plasmashell starts in the right session env.
+#
+#   bash scripts/headless/run-headless-kde.sh [WxH]    # default 1920x1080
+#
+# Then in another shell:
+#   WAYLAND_DISPLAY=wayland-kde XDG_CURRENT_DESKTOP=KDE PUNKTFUNK_ZEROCOPY=1 \
+#     punktfunk-host m3-host --source virtual --seconds 14400
+set -euo pipefail
+
+RES="${1:-1920x1080}"
+W="${RES%x*}"
+H="${RES#*x}"
+
+export XDG_RUNTIME_DIR="${XDG_RUNTIME_DIR:-/run/user/$(id -u)}"
+export DBUS_SESSION_BUS_ADDRESS="${DBUS_SESSION_BUS_ADDRESS:-unix:path=$XDG_RUNTIME_DIR/bus}"
+export XDG_CURRENT_DESKTOP=KDE
+export XDG_MENU_PREFIX=plasma-
+export KDE_FULL_SESSION=true
+export KDE_SESSION_VERSION=6
+export DESKTOP_SESSION=plasma
+export WAYLAND_DISPLAY=wayland-kde
+export KWIN_WAYLAND_NO_PERMISSION_CHECKS=1
+
+kwin_wayland --virtual --width "$W" --height "$H" --no-lockscreen \
+    --socket "$WAYLAND_DISPLAY" &
+KWIN_PID=$!
+sleep 2
+
+kbuildsycoca6 >/dev/null 2>&1 || true # rebuild the menu cache under the correct env
+plasmashell &
+
+echo "headless KDE up on $WAYLAND_DISPLAY ($RES), kwin pid $KWIN_PID"
+wait "$KWIN_PID"
diff --git a/scripts/headless/run-headless-sway.sh b/scripts/headless/run-headless-sway.sh
index 2b9c28c0..12c05595 100755
--- a/scripts/headless/run-headless-sway.sh
+++ b/scripts/headless/run-headless-sway.sh
@@ -1,8 +1,8 @@
 #!/usr/bin/env bash
-# Launch headless Sway on the NVIDIA box for the lumen M0 capture spike.
+# Launch headless Sway on the NVIDIA box for the punktfunk M0 capture spike.
 #
 # Runs on the user's *shared* session bus (NOT a private dbus-run-session) so that the
-# ScreenCast portal (xdg-desktop-portal-wlr) and the lumen host share one bus. After this
+# ScreenCast portal (xdg-desktop-portal-wlr) and the punktfunk host share one bus. After this
 # is up, run `prepare-session.sh` from a second shell to set the mode + portal env.
 #
 # Prereqs (see docs/linux-setup.md / scripts/bootstrap-ubuntu.sh):
diff --git a/scripts/headless/sway.config b/scripts/headless/sway.config
index 753910b2..37e20762 100644
--- a/scripts/headless/sway.config
+++ b/scripts/headless/sway.config
@@ -1,4 +1,4 @@
-# Minimal headless Sway config for the lumen M0 capture spike.
+# Minimal headless Sway config for the punktfunk M0 capture spike.
 # Under WLR_BACKENDS=headless, Sway 1.9 auto-creates one output named HEADLESS-1
 # (fixed 1920x1080); this just resizes it. For extra outputs: `swaymsg create_output`
 # (auto-named HEADLESS-2, ...). Set the resolution to your target client size.
diff --git a/scripts/host.env.example b/scripts/host.env.example
index 0f210434..5a0adf38 100644
--- a/scripts/host.env.example
+++ b/scripts/host.env.example
@@ -1,4 +1,4 @@
-# lumen host configuration (~/.config/lumen/host.env) — consumed by lumen-host.service.
+# punktfunk host configuration (~/.config/punktfunk/host.env) — consumed by punktfunk-host.service.
 
 # Session / compositor environment (headless KWin example).
 XDG_RUNTIME_DIR=/run/user/1000
@@ -8,15 +8,15 @@ XDG_CURRENT_DESKTOP=KDE
 
 # Video source: `virtual` creates a per-client virtual output at the client's exact
 # resolution+refresh (the flagship mode); `portal` captures an existing monitor.
-LUMEN_VIDEO_SOURCE=virtual
+PUNKTFUNK_VIDEO_SOURCE=virtual
 
 # GPU zero-copy capture (EGL/Vulkan → CUDA → NVENC). Falls back to CPU automatically.
-LUMEN_ZEROCOPY=1
+PUNKTFUNK_ZEROCOPY=1
 
 # Optional overrides (apps.json is the primary mechanism for per-app settings):
-#LUMEN_COMPOSITOR=kwin          # kwin | mutter | gamescope | wlroots
-#LUMEN_GAMESCOPE_APP=vkcube     # nested command for ad-hoc gamescope sessions
-#LUMEN_INPUT_BACKEND=libei      # wlr | libei | gamescope | uinput
-#LUMEN_FEC_PCT=20               # video FEC overhead percent
-#LUMEN_PERF=1                   # per-stage timing logs
+#PUNKTFUNK_COMPOSITOR=kwin          # kwin | mutter | gamescope | wlroots
+#PUNKTFUNK_GAMESCOPE_APP=vkcube     # nested command for ad-hoc gamescope sessions
+#PUNKTFUNK_INPUT_BACKEND=libei      # wlr | libei | gamescope | uinput
+#PUNKTFUNK_FEC_PCT=20               # video FEC overhead percent
+#PUNKTFUNK_PERF=1                   # per-stage timing logs
 #RUST_LOG=info
diff --git a/scripts/lumen-host.service b/scripts/lumen-host.service
deleted file mode 100644
index 754358f3..00000000
--- a/scripts/lumen-host.service
+++ /dev/null
@@ -1,21 +0,0 @@
-# lumen streaming host — systemd USER unit.
-#
-# Install:
-#   mkdir -p ~/.config/systemd/user && cp scripts/lumen-host.service ~/.config/systemd/user/
-#   cp scripts/host.env.example ~/.config/lumen/host.env   # then edit
-#   systemctl --user daemon-reload && systemctl --user enable --now lumen-host
-#
-# The unit assumes the compositor session (e.g. headless KWin on wayland-kde) is already up;
-# for a fully self-contained appliance, pair it with a kwin_wayland user unit it can After=.
-[Unit]
-Description=lumen GameStream host
-After=pipewire.service
-
-[Service]
-EnvironmentFile=%h/.config/lumen/host.env
-ExecStart=%h/lumen/target/release/lumen-host serve
-Restart=on-failure
-RestartSec=2
-
-[Install]
-WantedBy=default.target
diff --git a/scripts/punktfunk-host.service b/scripts/punktfunk-host.service
new file mode 100644
index 00000000..f168d3d3
--- /dev/null
+++ b/scripts/punktfunk-host.service
@@ -0,0 +1,21 @@
+# punktfunk streaming host — systemd USER unit.
+#
+# Install:
+#   mkdir -p ~/.config/systemd/user && cp scripts/punktfunk-host.service ~/.config/systemd/user/
+#   cp scripts/host.env.example ~/.config/punktfunk/host.env   # then edit
+#   systemctl --user daemon-reload && systemctl --user enable --now punktfunk-host
+#
+# The unit assumes the compositor session (e.g. headless KWin on wayland-kde) is already up;
+# for a fully self-contained appliance, pair it with a kwin_wayland user unit it can After=.
+[Unit]
+Description=punktfunk GameStream host
+After=pipewire.service
+
+[Service]
+EnvironmentFile=%h/.config/punktfunk/host.env
+ExecStart=%h/punktfunk/target/release/punktfunk-host serve
+Restart=on-failure
+RestartSec=2
+
+[Install]
+WantedBy=default.target
diff --git a/tools/loss-harness/Cargo.toml b/tools/loss-harness/Cargo.toml
index fc8d7fd2..3c8e034f 100644
--- a/tools/loss-harness/Cargo.toml
+++ b/tools/loss-harness/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "loss-harness"
-description = "FEC loss-resilience sweep over the lumen-core loopback (plan §10)"
+description = "FEC loss-resilience sweep over the punktfunk-core loopback (plan §10)"
 version.workspace = true
 edition.workspace = true
 rust-version.workspace = true
@@ -9,4 +9,4 @@ authors.workspace = true
 repository.workspace = true
 
 [dependencies]
-lumen-core = { path = "../../crates/lumen-core" }
+punktfunk-core = { path = "../../crates/punktfunk-core" }
diff --git a/tools/loss-harness/src/main.rs b/tools/loss-harness/src/main.rs
index cac7a713..d46ffcb9 100644
--- a/tools/loss-harness/src/main.rs
+++ b/tools/loss-harness/src/main.rs
@@ -2,20 +2,20 @@
 //!
 //! Drives access units through the in-process loopback at increasing loss rates, for
 //! both FEC schemes, and prints how many frames survive. A pure-software stand-in for
-//! `tc netem` that needs no network and runs anywhere `lumen_core` builds. The real M3
+//! `tc netem` that needs no network and runs anywhere `punktfunk_core` builds. The real M3
 //! harness adds `tc netem` jitter/reorder on the UDP path.
 
-use lumen_core::config::{Config, FecConfig, FecScheme, ProtocolPhase, Role};
-use lumen_core::error::LumenError;
-use lumen_core::session::Session;
-use lumen_core::transport::loopback_pair;
+use punktfunk_core::config::{Config, FecConfig, FecScheme, ProtocolPhase, Role};
+use punktfunk_core::error::PunktfunkError;
+use punktfunk_core::session::Session;
+use punktfunk_core::transport::loopback_pair;
 
 fn config(role: Role, scheme: FecScheme, drop_period: u32) -> Config {
     Config {
         role,
         phase: match scheme {
             FecScheme::Gf8 => ProtocolPhase::P1GameStream,
-            FecScheme::Gf16 => ProtocolPhase::P2Lumen,
+            FecScheme::Gf16 => ProtocolPhase::P2Punktfunk,
         },
         fec: FecConfig {
             scheme,
@@ -47,7 +47,7 @@ fn run(scheme: FecScheme, drop_period: u32, frames: usize, frame_len: usize) ->
                     completed += 1;
                 }
             }
-            Err(LumenError::NoFrame) => {} // unrecoverable at this loss rate
+            Err(PunktfunkError::NoFrame) => {} // unrecoverable at this loss rate
             Err(e) => panic!("unexpected error: {e}"),
         }
     }
@@ -59,7 +59,7 @@ fn main() {
     let frame_len = 100_000; // ~98 shards across 2 FEC blocks
     let periods = [0u32, 32, 16, 8, 6, 4, 3, 2];
 
-    println!("lumen loss-harness — 25% FEC, {frames} frames of {frame_len} bytes");
+    println!("punktfunk loss-harness — 25% FEC, {frames} frames of {frame_len} bytes");
     println!("(GF8 = P1/GameStream-compat, GF16 = P2/wall-breaker)\n");
     println!(
         "{:>10}  {:>9}  {:>14}  {:>14}",