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Add fail-closed Dawn Linux external provider seam - #638
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This was referenced Sep 19, 2026
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Fixes #637. Parent #28 remains open for the real native-device allocator, hardware negotiation, AppScene consumer and runtime gates.
This adds the fail-closed Dawn Linux external-image provider seam: exact public device-token binding, feature/backend proof, injected external allocation identity, direct SharedTextureMemory import, BeginAccess/EndAccess fence and layout ownership, owned exported FDs, and v3 provider publication. The pinned public Dawn ABI cannot expose enough native Vulkan identity to construct or verify the host allocator, so that case reports
native_device_provider_required; ordinary textures and CPU fallback remain prohibited.Validation:
git diff 997c4e6e..HEAD --checkonly.