feat(host): scatter/gather DMA descriptor (W63, R-HS-11) - #840
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Wave 63 (R-HS-11): SgDescriptor, SgSegment, SgError. Multi-segment DMA with overlap validation and execute(). 16 new tests, all pass. 832 total.
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Closes #839
Wave 63 (R-HS-11): Host scatter/gather DMA descriptor
What
bootstrap/src/host/scatter_gather.rsSgDescriptorwith ordered segmentsSgSegment: src_offset, dst_offset, length, overlap detectionvalidate_no_overlap(): detect overlapping source rangesexecute(src, dst): copy scattered regions from src to dst bufferSgError: EmptyDescriptor, ZeroLength, OverlappingRanges, ExceedsBufferSizeTests
16 new inline tests, all pass. 832 total.