Fix Serial pin reassignment on speed change; document LISTEN_ONLY vs emulation wiring#3

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jenogc:fix/serial-pin-reassignment-on-speed-change

Commits on Mar 11, 2026

Fix Serial pin reassignment on speed change and document wiring modes
claude
committed

Commits on Mar 12, 2026

Extract serial pin numbers into named constants (address review comment)
claude
committed