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Expose exact Windows Dawn device and direct queue - #813
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Closes #812.
AppScene's Windows host needs the exact D3D12 device and direct queue owned by its public Dawn
WGPUDevice; without that seam it would need private Dawn headers or a second GPU device. This adds a size/versioned C query to the sealed Windows Dawn SDK, backed by the existing live-device registry, and returns the borrowed device, direct queue, adapter LUID, and public owner tokens.The SDK build now patches the registry on Windows, exports only the C bridge entry point, stages and hashes the exact bridge sources, and rejects missing or mixed artifacts. Source gates cover validation ordering and packaging, and the deferred runner/VM acceptance matrix is recorded in
docs/validation/windows-exact-dawn-device-812.md.Validation execution was intentionally deferred under the current fast implementation direction.
git diff --checkpassed before commit; no build or test suite was run.