Delay a startup's execsequence by (t* − eta) instead of firing it at tick 0.
Previously the ladder fired immediately for every starting pump; a
faster-than-slowest startup then reached `operational` early and sat at its
minimum flow (calcFlow at min position is non-zero) from warmup-end until its
delayed ramp — leaking ~one pump's minimum flow into the group total before
the rendezvous instant t* (the 207→309 staging bump observed live).
Now the whole startup (ladder + ramp) is delayed: the ladder begins at
(t* − eta), completes at (t* − rampS), then the queued flowmovement ramps to
finish exactly at t*. The slowest pump (eta == t*) still fires at tick 0.
Sum-of-flows is monotonic through the transition.
Updated movementScheduler.basic.test.js mixed-speed multi-startup assertions.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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