docs(site): make docs-site the knowledge base — status tracker + setup guides

Per the new docs workflow (docs-site = KB layer; repo docs/ keeps design notes):
- Add a canonical Status & Progress tracker (status.md): milestones, per-box live
  state, and a dated progress log — the go-forward place to track progress.
- Add setup guides: GNOME/Mutter host (gnome-box — Secure Boot MOK enroll, the
  libnvidia-gl EGL fix, autologin, screen-lock disable, appliance unit), headless
  KDE box, and Bazzite host (ujust input group, gamescope session, gotchas).
- Roadmap is now canonical in docs-site (synced the skew-handshake section 12
  update); removed the repo docs/roadmap.md copy and repointed README to docs-site.
- Nav (meta.json) + landing cards updated; site builds (bun run build).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs-site/content/docs/bazzite.md

@@ -0,0 +1,49 @@
+---
+title: "Bazzite / SteamOS-like Host"
+description: "Run punktfunk on Bazzite as a headless Steam host — gamescope session at the client's mode, input perms, and the gotchas."
+---
+
+Running punktfunk on **Bazzite** (Fedora Atomic / SteamOS-like) as a headless game-streaming host.
+The host launches a **gamescope** session at the *client's* exact resolution + refresh, so games see
+the client mode, not the box's TV. Full packaging (COPR / RPM / bootc) is in
+[`packaging/bazzite/README.md`](https://github.com); this page is the operational quick-reference.
+
+## Input permissions — use the ujust command
+
+Gamepad + DualSense injection needs the user in the `input` group. On Bazzite you **can't** just
+`usermod -aG input` (the immutable base + how the group is managed) — use the provided recipe:
+
+```sh
+ujust add-user-to-input-group
+```
+
+The udev rule (`60-punktfunk.rules`) grants access to `/dev/uinput` and `/dev/uhid`. A DualSense that
+shows "detected but no input" is almost always this **host-side** `/dev/uhid`/`/dev/uinput`
+permission, not a client bug — confirm the input group + the udev rule, then re-login.
+
+## Headless Steam session at the client's mode
+
+The host owns a `gamescope-session-plus` session and relaunches it when the client mode changes, so
+games run at the client's resolution + refresh (`--nested-refresh` + a generated CVT mode). Requires
+the headless-appliance prerequisites (linger + `multi-user.target`) and **no** physical gaming
+session running. Configure via `host.env`:
+
+```sh
+PUNKTFUNK_COMPOSITOR=gamescope
+PUNKTFUNK_GAMESCOPE_SESSION=steam   # host owns the session at the client mode
+PUNKTFUNK_INPUT_BACKEND=gamescope
+```
+
+## Gotchas
+
+- **gamescope ≥ 3.16.22 required.** Older versions deadlock capturing on PipeWire ≥ 1.6 (a loop-lock
+  bug), and a wedged capture link head-blocks the whole PipeWire daemon. Never `pkill -x gamescope-wl`
+  on a box where it's the live session compositor — it kills the user's session.
+- **The hardware cursor isn't in the capture** (gamescope limitation; won't-fix for now).
+- **HDR is blocked upstream**: gamescope's capture node is 8-bit only (PipeWire HDR export
+  unimplemented), so HDR/10-bit is deferred even though the downstream encode path is ready.
+
+## FFmpeg
+
+Bazzite ships FFmpeg 7.x / libavcodec 61 — `ffmpeg-sys-next` auto-detects it and the host builds
+against it (validated live). NVENC (`hevc_nvenc` / `av1_nvenc`) works through the system FFmpeg.