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Add exact-device Linux external factory - #647
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This was referenced Sep 19, 2026
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Closes #645 under #28. Follow-up #646 owns the pinned Dawn native-device hook and AppScene factory implementation.
Add an atomic exact-device Linux external factory contract: public Dawn adapter/device tokens, opaque native Vulkan identities, device/driver UUIDs, queue family and one shared lifetime anchor. Concrete external allocations own their Vulkan image, memory, exported FD and retained create-info until SharedTextureMemory retirement. Mismatched or incomplete identities fail closed, with no ordinary-texture or CPU fallback.
Base:
999325f6899c1e265e00b15fa0658d0bf71fd031Implementation:
779f2620877cf86093c2f0b7281c1cc9833a85ebValidation under the current throughput policy:
git diff 999325f6..HEAD --check.