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Two additions to pumpingStation: 1. _controlLevelBased now calls _applyMachineGroupLevelControl in addition to _applyMachineLevelControl when the basin is filling above startLevel. Previously only direct-child machines received the level-based percent-control signal; in a hierarchical topology (PS → MGC → pumps) the machines sit under MGC and PS.machines is empty, so the level control never reached them. 2. New 'Qd' input topic + forwardDemandToChildren() method. When PS is in 'manual' mode (matching the pattern from rotatingMachine's virtualControl), operator demand from a dashboard slider is forwarded to all child machine groups and direct machines. When PS is in any other mode (levelbased, flowbased, etc.), the Qd msg is silently dropped with a debug log so the automatic control isn't overridden. No breaking changes — existing flows that don't send 'Qd' are unaffected, and _controlLevelBased's additional call to machineGroupLevelControl is a no-op when no machine groups are registered. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>