forked from unom/punktfunk
The `stats:` line's decode-path tag is derived from the DecodedImage variant, and both D3D11VA rungs deliver DecodedImage::D3d11 — they share the hand-off ring on purpose. So a native-d3d11va session and an FFmpeg-d3d11va session emitted a byte-identical tag, and nothing downstream could tell them apart. The native Vulkan rung never had this: it carries its own variant, hence its own `native-vulkan` tag. That is not cosmetic, and it was found the only way it could be — by running the rung on glass and having to grep the log to prove which one had answered. A native pin that fails to initialise falls through to the FFmpeg rung by design; the line it then emits is exactly the line the native rung would have emitted. M5's owed soak and M9's vendor-matrix bake both rest on attributing a session to a rung, and until now the machine-readable half of that evidence could not do it. This project has already shipped one measurement that could not tell "clean" from "unmeasured"; this is the same shape. D3d11Frame now records which rung wrote the surface, keyed off the pin constant itself rather than a second field the two rungs could set inconsistently — the native rung passes DECODER_PIN into the hand-off and nothing else does. The stats line stays additive for every shipping session: the only value that changes belongs to a rung that is pin-only and deliberately absent from the automatic ladder, and the Windows shell passes the line through opaquely rather than matching on the tag. Verified on glass on .173, both directions: pinned native-d3d11va gives 85 windows tagged `native-d3d11va` and 0 plain, pinned d3d11va gives 64 plain and 0 native, zero errors either way. Gates: clippy -D warnings on Windows, the Linux container's clippy/tests/workspace check, rustfmt.