Code quality review caught:
- sizeofDEIC was a local; promoted to public const DrawCommandStride
so tests can reference it symbolically.
- BatchDataPublic layout invariant (size + field offsets) wasn't
asserted in tests. Added BatchDataPublic_LayoutMatchesPrivateBatchData
+ DrawCommandStride_MatchesStructSize tests to gate Task 10's
MemoryMarshal.Cast<BatchData, BatchDataPublic> safety.
- Plan doc updated: BatchDataPublic spec was Pack=4 (wrong — must
match private BatchData's Pack=8 for the cast to work). Implementation
was already correct; plan now matches.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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