Adds the _dispatchInFlight gate that mirrors rotatingMachine
state.delayedMove. Before this, PS at 1 Hz overran in-flight pump
ramps via concurrent handleInput entries, producing the live thrash:
120 aborts / 2 min, pump_b clamped at minFlow.
Includes regression test:
test/mgc-overactive-demand-serialization.integration.test.js
covering concurrent-burst serialization (30 calls → ≤ 5 aborts) and
latest-wins semantic.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
