PS calls turnOffAllMachines on every tick once level < stopLevel. Two
ways the pump could re-engage after we shut it down:
1. _delayedCall: a 1% dead-zone keep-alive parked in MGC's deferred
dispatch fires from the in-flight handleInput's finally block AFTER
the shutdown completes, dispatching flow + startup to a fresh pump.
Clear _delayedCall at the top of turnOff.
2. Concurrent shutdown calls on the same pump interrupt each other
before the sequence can transition past stopping. Track shutdown-
in-flight per pump and skip if one is already underway.
Together with the rotatingMachine delayedMove-clearing fix, this lets
the level-based hysteresis cycle complete: pumps shut off cleanly at
stopLevel, basin reverses direction, refills to startLevel, repeat.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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