- scripts/diagnostics/test-pipeline.py: full end-to-end test
- just diag-full: run pipeline diagnostic
- just viz-log/midi-log: watch service logs live
- just viz-stats/midi-stats: check counters
- just reset-mcu: reset MCU + reopen serial via router RPC
- just test-chord: send test MIDI chord locally
- just fix-perms: restore +x bits on all scripts
