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/lib.rs

@@ -115,6 +115,13 @@ pub struct OutputFormat {
     /// Linux it forces the CPU RGB path the encoder swscales to `YUV444P`. `false` on every
     /// 4:2:0 session.
     pub chroma_444: bool,
+    /// A PyroWave (wavelet) session on Windows: the IDD-push capturer must make its NV12 out-ring
+    /// **shareable** (`SHARED | SHARED_NTHANDLE`) and signal a **shared fence** after each convert,
+    /// so the pyrowave encoder can zero-copy-import the texture into its own Vulkan device
+    /// (design/pyrowave-windows-host-zerocopy.md). Also forces the NV12 4:2:0 SDR convert branch
+    /// (never BGRA-passthrough / P010). `false` on every non-PyroWave session and on Linux (the
+    /// wavelet encoder ingests dmabufs / CPU RGB there, not a D3D11 texture).
+    pub pyrowave: bool,
 }
 
 impl OutputFormat {
@@ -130,6 +137,8 @@ impl OutputFormat {
             hdr,
             // The GameStream + spike paths are always 4:2:0 (4:4:4 is punktfunk/1-native only).
             chroma_444: false,
+            // GameStream never negotiates PyroWave (native punktfunk/1 only).
+            pyrowave: false,
         }
     }
 }