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2110cdbe76
FSK Manchester zerobit, on-air CRC-16 (poly 0x1021, init 0x68b3) as the integrity gate. Removes a self-synchronizing transform (x^7 + x^5 + 1) to recover a constant sync marker, and parses the raw on-air payload's rolling state, transmission counter, and command (open/close/stop/ automode) from a relocated, state-normalized byte pair. See the decoder's doc comment for the full derivation and known limits. Enabled by default; CRC-16 gates false positives.