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Iter 21 — ultra-opt for protocol correctness across the two production decoders. Pin the same 32-byte canonical hex in both Python and Rust tests; if either decoder drifts from the wire, ONE of the tests starts failing — and it's clear which side moved. Canonical packet: COM9 sync-pkt #1 from §A0.12 live capture, expressed as exact little-endian bytes: 10a111c5 09 01 06 00 magic + node + ver + flags + rsvd f26db70100000000 local_us = 28_798_450 c5aca50100000000 epoch_us = 27_634_885 1400000000000000 sequence = 20 + reserved Python test: archive/v1/tests/unit/test_esp32_binary_parser.py::TestSyncPacketParser ::test_canonical_wire_bytes_match_rust_decoder — decodes the pinned hex, asserts every field including the §A0.10 1,163,565 µs offset. Rust test: v2/crates/wifi-densepose-hardware/src/sync_packet.rs::tests ::canonical_wire_bytes_match_python_decoder — decodes the same bytes, asserts the same fields, then re-encodes via to_bytes() and asserts the round-trip produces the EXACT same 32 bytes. So this also catches drift in the Rust encoder. Test counts after this iter: Rust sync_packet: 15/15 green (was 14) Python SyncPacketParser: 7/7 green (was 6) Branch contract: if a future PR changes the firmware wire format, BOTH tests must be updated atomically with the new canonical hex. CI will gate this naturally. Co-Authored-By: claude-flow <ruv@ruv.net>