Auto-detect the board serial port in the live monitor - #67
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The monitor defaulted to /dev/ttyACM0, which is usually the CMSIS-DAP debug probe's UART bridge when the probe and board are both plugged in -- so the live TUI opened the wrong device and showed no telemetry. Default --port to auto-detect instead: scan USB serial ports for the Raspberry Pi vendor id and pick the sole non-probe match, erroring with what it saw (so --port is the escape hatch) when the choice is empty or ambiguous. An explicit --port still wins. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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The live monitor defaulted to
/dev/ttyACM0, which is usually the CMSIS-DAP debug probe's UART bridge when the probe and board are both plugged in. So the TUI opened the wrong device and showed no telemetry (the "hardware telemetry in the TUI isn't working" report).--portnow defaults to auto-detect: scan USB serial ports for the Raspberry Pi vendor id (0x2e8a) and pick the sole non-probe match, excluding the debug probe's CDC (pid 0x000c).--portis the escape hatch) when the choice is empty or ambiguous. An explicit--portstill wins.find_device_portuses pyserial'slist_ports(portable, no udev), covered by tests for probe-vs-board selection, non-Raspberry ports, and the empty/ambiguous error paths.Verification: 212 sim tests green (4 new).