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Add D3D12 shared image consumer ABI - #596
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This was referenced Sep 19, 2026
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Closes #595. Advances SceneTech/AppScene#183 and SceneTech/AppScene#130.
Expose an ABI v3 D3D12/DXGI shared-image consumer owner that atomically duplicates the texture and all producer-fence handles, preserves exact generation/content/adapter metadata, exposes indexed 64-bit fence values, and keeps presenter completion/retirement explicit.
Windows SDK headers/import-library packaging remains a follow-up.
git diff --checkpassed; authored ABI and Windows runtime gates were not executed under the current implementation-throughput policy.