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Add Linux external-image export ABI - #630
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This was referenced Sep 19, 2026
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Fixes #629. Parent #28 remains open for the concrete Vulkan external-memory allocator/provider, Dawn access integration and Linux hardware/runtime acceptance.
This adds the versioned Linux external-image ABI for opaque-FD/DMABUF planes, Vulkan identity/layout/queue metadata and SyncFD/opaque-semaphore waits. Descriptors acquire CLOEXEC duplicates atomically, roll back on failure, and use explicit shared-owner and consumer-retirement semantics. Unsupported providers fail specifically. The public header, exports, CMake surface and every RID SDK package are covered.
Validation:
git diff 5e5b14a2..HEAD --checkonly, per the current fast implementation directive.