Iter 20 — defensive ultra-opt: one test that exercises the entire
iter 14→17 chain in a single assertion, so any future refactor that
breaks the contract surfaces as a single, named regression instead of
14 unit-test diffs to triangulate.
1. firmware emits sync packet (bytes built here as a stand-in)
2. host decodes via SyncPacket::from_bytes — assert round-trip
3. a CSI frame arrives 100 sequences later (≈ 5 s @ 20 fps)
4. mesh_aligned_us_for_sequence recovers the mesh timestamp
5. cross-check: same value via raw apply_to_local
Asserts mesh_us == sync.epoch_us + 5_000_000 µs exactly, plus both
paths (sequence-interpolation + direct local→mesh) agree byte-for-byte.
Result: 14/14 sync_packet tests pass, full wifi-densepose-hardware
crate at 136/136 (no regression from iter 1-19). Contract for any
ADR-029/030 multistatic fusion consumer is now defended by a test that
fails loud if either piece of the chain drifts.
Co-Authored-By: claude-flow <ruv@ruv.net>
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