Ground-truth pass found lcxl-leds-watch.service (the v2 LED watcher) still
running beside the v3 driver — the likely author of the paint-reset mystery —
and midi-autoconnect as the probable Midi-Thru→SC re-adder. Plan: kill the
tug-of-war first, then the A1 label off-by-one, then the generalize thread
PLN named (track-follow + live BPM from the cps knob), then the display
probe with his eyes on the device.