docs: clarify HDR is supported on the Windows host (Linux still blocked)

HDR (10-bit BT.2020 PQ) works end-to-end with the Windows host — it captures
an HDR desktop (WGC FP16 / Desktop-Duplication FP16 for the secure desktop)
and encodes HEVC Main10 to HDR-capable clients (Windows, Android). Only the
Linux host is blocked upstream (no 10-bit compositor capture). Corrected the
roadmap (grid + shipped/blocked), Windows Host page, status, and CLAUDE.md.

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

docs-site/content/docs/roadmap.md

@@ -24,7 +24,7 @@ see [Status & Progress](/docs/status).
 | Web console + pairing | ✅ |
 | Concurrent sessions (shared desktop) | ✅ |
 | Network speed test + bitrate | ✅ |
-| HDR / 10-bit (host capture) | ⛔ |
+| HDR / 10-bit streaming | ✅ Windows host · ⛔ Linux host |
 | Sub-frame pipelining (latency) | 🔭 |
 
 ## ✅ Shipped
@@ -35,8 +35,9 @@ see [Status & Progress](/docs/status).
 - **Native-resolution virtual displays** on Linux across KWin, GNOME/Mutter, gamescope, and
   Sway/wlroots, with a fully zero-copy GPU path to NVENC (stable 240 fps at 5120×1440).
 - **A native Windows host** (NVIDIA, x64) — a signed installer with secure-desktop capture and a
-  bundled virtual-display driver. See [Windows Host](/docs/windows-host). *(Beta — newer than the
-  Linux host.)*
+  bundled virtual-display driver, and the only host that can stream **HDR** (10-bit BT.2020 PQ,
+  captured from an HDR Windows desktop and encoded as HEVC Main10). See
+  [Windows Host](/docs/windows-host). *(Beta — newer than the Linux host.)*
 - **Clients on every platform** — native apps for **Apple** (macOS, iOS, iPadOS, tvOS), **Linux**,
   **Android** (phone + TV), and **Windows**, each with hardware decode, controllers including
   DualSense, audio + mic, and automatic host discovery. See [Clients](/docs/clients).
@@ -67,8 +68,10 @@ see [Status & Progress](/docs/status).
 
 ## ⛔ Parked / blocked
 
-- **HDR / 10-bit streaming.** Designed end to end, but blocked upstream — no shipping compositor emits
-  a 10-bit/HDR capture stream yet. Ready to build the moment one lands.
+- **HDR / 10-bit on the *Linux* host.** HDR streaming already works from a
+  [Windows host](/docs/windows-host) to an HDR-capable client (Windows, Android). On Linux it's
+  blocked upstream — no shipping compositor emits a 10-bit/HDR capture stream yet — and ready the
+  moment one does.
 - **Advanced DualSense voice-coil haptics.** Scoped and shelved (it rides the controller's USB audio
   interface, with near-zero game support on Linux). Adaptive triggers, rumble, and the lightbar
   already ship.

docs-site/content/docs/status.md

@@ -36,6 +36,9 @@ Linux, Windows, and Android.
 - **Zero-copy GPU pipeline.** Captured frames stay on the GPU (dmabuf → CUDA → NVENC) with
   automatic split-encode at very high resolutions. Stable 240 fps at 5120×1440 has been
   measured.
+- **HDR (10-bit), on the Windows host.** An HDR Windows desktop is captured and encoded as HEVC
+  Main10 (BT.2020 PQ) to HDR-capable clients (Windows, Android). Linux hosts stream 8-bit for now —
+  HDR there is blocked upstream at the compositor.
 - **Secure by default.** A **SPAKE2 PIN pairing** ceremony establishes trust (the host
   shows a 4-digit PIN; an attacker gets a single online guess, no offline dictionary
   attack). Trust-on-first-use (TOFU) remains an explicit opt-in for fully trusted LANs.

docs-site/content/docs/windows-host.md

@@ -7,8 +7,9 @@ description: "Run the punktfunk streaming host on a Windows PC with an NVIDIA GP
 **Status: implemented and shipping — NVIDIA-only, x64-only.** punktfunk is Linux-first, but it also
 runs as a native **Windows host**: a signed installer registers a `LocalSystem` service that streams
 your Windows desktop or games to any punktfunk or Moonlight client, at the client's exact resolution
-via a virtual display. It's newer and less battle-tested than the Linux host, and it is built
-specifically around NVIDIA hardware.
+via a virtual display — including **HDR10** (10-bit BT.2020 PQ) when your Windows desktop is in HDR
+mode. It's newer and less battle-tested than the Linux host, and it is built specifically around
+NVIDIA hardware. (The Linux host is 8-bit only — HDR there is blocked upstream.)
 
 > This page is about the Windows **host** (streaming *from* a Windows PC). To stream *to* a Windows
 > PC, see the [Windows client](/docs/clients#windows-desktop-client).
@@ -48,9 +49,9 @@ pipeline orchestration are all shared with the Linux host. The Windows host is a
 
 | Subsystem | Linux backend | Windows backend |
 |---|---|---|
-| **Capture** | xdg ScreenCast portal → PipeWire (dmabuf) | **DXGI Desktop Duplication** → D3D11 texture |
+| **Capture** | xdg ScreenCast portal → PipeWire (dmabuf) | **Windows.Graphics.Capture** (+ Desktop Duplication for the secure desktop) → D3D11 texture; FP16/10-bit when the desktop is HDR |
 | **Virtual display** | KWin / Mutter / Sway / gamescope | **SudoVDA** signed IDD — create a `WxH@Hz` monitor per session, capture it, tear it down |
-| **Encode** | `ffmpeg-next` NVENC (CUDA hwframes) | **NVENC** with a D3D11 device (`--features nvenc`) |
+| **Encode** | `ffmpeg-next` NVENC (CUDA hwframes) | **NVENC** with a D3D11 device (`--features nvenc`); HEVC Main10 / BT.2020 PQ for HDR |
 | **Input — mouse/keyboard** | libei / wlr protocols | **SendInput** (Win32 VK + absolute mouse) |
 | **Input — gamepads** | uinput Xbox 360 pad + rumble | **ViGEm** virtual pad + rumble back-channel |
 | **Audio capture** | PipeWire sink-monitor | **WASAPI loopback** |