fix(dx12): match indirect descriptor ABI size#258
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This was referenced Jul 14, 2026
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Summary
Match the native D3D12_INDIRECT_ARGUMENT_DESC layout: its largest union member is three uint32 values, so the union is 12 bytes and the full descriptor is 16 bytes. Add exact size and offset assertions.
This extracts the independent DX12 ABI correctness fix from #253. It contains no counted-draw or prepared-indexed behavior.
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