feat(pyrowave): Windows host encoder — separate-plane zero-copy D3D11→Vulkan

Wire PyroWave into the Windows host (design/pyrowave-windows-host-zerocopy.md).
Before this a macOS client + Windows host that both selected PyroWave silently ran
HEVC: the host never advertised CODEC_PYROWAVE and open_video_backend bailed.

Approach (zero-copy, no GPU→CPU→GPU): pyrowave owns its own Vulkan device
(create_device_by_compat, by render-GPU vendor/device-id — NOT LUID, invalid in
Session 0). The capturer runs a BGRA→YUV BT.709-limited CSC (matching rgb2yuv.comp)
into TWO SEPARATE shareable plane textures — full-res R8 Y + half-res R8G8 CbCr —
which the encoder imports into pyrowave's device. Separate single/two-component
textures import reliably on NVIDIA at any size; a single planar NV12 import does NOT
(the vendored interop test: "only very specific resource sizes" — confirmed on-glass:
1024² fine, 720p/1080p/1440p garbage). A shared D3D11 fence, signalled after the CSC,
is imported as a Vulkan timeline semaphore so the wavelet read is ordered after it.

- pf-encode: enc/windows/pyrowave.rs (Encoder impl, two-plane import + Linux-style
  plane views); host_wire_caps advertises CODEC_PYROWAVE on Windows when the backend
  isn't Software; open_video_backend routes a negotiated PyroWave session first;
  pyrowave-sys on the Windows target; interop confirmed at open → clean HEVC fallback.
- pf-encode: shared, unit-tested enc/pyrowave_wire.rs (single source of truth for the
  client-facing AU framing); Linux encoder uses it too.
- pf-capture: dxgi.rs BgraToYuvPlanes CSC; idd_push.rs pyrowave mode — forces the
  virtual display SDR (the VideoProcessor can't ingest the FP16 HDR ring), a
  two-plane shareable out-ring, a shared fence passed every frame (so a rebuilt
  encoder re-imports it). Threaded via OutputFormat::pyrowave.
- pf-frame: D3d11Frame::pyro carries the CbCr plane + fence; OutputFormat::pyrowave.

Verified on .173 (RTX 4090): full-host build + clippy -D warnings (nvenc,amf-qsv) +
fmt --all --check; pyrowave_wire unit tests; pyrowave_win_smoke GPU test round-trips
distinct Y/Cb/Cr (100/180/60) exactly at 1024²/720p/1080p/1440p; Stage-0 interop
validated in the real Session-0 service context on-glass. Deployed to the box.
Owed: final on-glass picture/latency confirmation.

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

crates/pf-frame/src/dxgi.rs

@@ -34,10 +34,35 @@ pub struct WinCaptureTarget {
     pub wudf_pid: u32,
 }
 
-/// A GPU-resident captured texture (future NVENC-D3D11 zero-copy path).
+/// The PyroWave (Windows) zero-copy sharing payload attached to a captured frame: the SECOND plane
+/// texture + the cross-device fence the wavelet encoder needs (design/pyrowave-windows-host-
+/// zerocopy.md). The wavelet encoder ingests **two SEPARATE** shareable plane textures — the full-res
+/// `R8_UNORM` **Y** rides [`D3d11Frame::texture`], and the half-res `R8G8_UNORM` **CbCr** rides
+/// [`cbcr`](Self::cbcr) — because importing a single *planar* NV12 texture into Vulkan is unreliable
+/// on NVIDIA at arbitrary sizes; separate single/two-component textures import reliably. `None` on
+/// every non-PyroWave frame (NVENC/AMF/QSV encode the in-place NV12/BGRA and need no cross-device
+/// fence). The encoder makes each texture's shared handle on demand.
+pub struct PyroFrameShare {
+    /// The half-res `R8G8_UNORM` interleaved CbCr plane (created `SHARED | SHARED_NTHANDLE`). The
+    /// full-res Y plane is [`D3d11Frame::texture`].
+    pub cbcr: ID3D11Texture2D,
+    /// The shared D3D11/D3D12 **fence** NT handle (raw), passed on EVERY frame; the encoder imports
+    /// it (duplicating) whenever it has no timeline yet (first frame or after an encoder rebuild).
+    pub fence_handle: Option<isize>,
+    /// The fence value the capturer signalled after THIS frame's convert. The encoder's Vulkan
+    /// acquire waits on it, so the wavelet read is ordered after the D3D11 CSC.
+    pub fence_value: u64,
+}
+
+/// A GPU-resident captured texture (the Windows zero-copy path: NVENC/AMF/QSV encode it in place;
+/// the PyroWave backend imports it — plus the second plane in [`pyro`](Self::pyro) — into its own
+/// Vulkan device). For a PyroWave frame, `texture` is the full-res `R8_UNORM` Y plane.
 pub struct D3d11Frame {
     pub texture: ID3D11Texture2D,
     pub device: ID3D11Device,
+    /// PyroWave zero-copy sharing info (the CbCr plane + fence); `None` unless this is a PyroWave
+    /// session. See [`PyroFrameShare`].
+    pub pyro: Option<PyroFrameShare>,
 }
 // SAFETY: `D3d11Frame` owns an `ID3D11Texture2D` + `ID3D11Device`, which are COM interface pointers.
 // D3D11 devices/resources use thread-safe (interlocked) COM reference counting, and the device is