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On the Windows WGC HDR path the FP16 scRGB capture was fed to NVENC as R10G10B10A2 (BT.2020 PQ), and NVENC did the RGB→YUV CSC internally on the contended SM — adding to the encode_ms wall under a GPU-saturating game. (NVIDIA's D3D11 VideoProcessor can't do RGB→P010 for HDR; that path renders green, confirmed live — so the convert must be ours.) New `HdrP010Converter` fuses the tone-map with the BT.2020 RGB→YUV matrix and emits P010 (10-bit limited range) directly: a luma pass → an R16_UNORM plane RTV (full-res) and a chroma pass → an R16G16_UNORM plane RTV (half-res, 2x2 box average) of a DXGI_FORMAT_P010 texture. NVENC then takes native P010 and skips its SM-side convert. Gated behind PUNKTFUNK_HDR_SHADER_P010 (default OFF → the existing R10→NVENC path is byte-for-byte unchanged). Colour validated by a new `hdr-p010-selftest` subcommand: a synthetic scRGB pattern → P010 → readback, compared to a BT.2020 PQ 10-bit reference — max abs error Y=0.99 / Cb=0.82 / Cr=0.75 codes on an RTX 4090. Live-validated HDR colours correct (no green). Build + clippy (--features nvenc -D warnings) green on x86_64-pc-windows-msvc. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>