P5 wave 1: extract rotatingMachine concerns into focused modules

src/curves/         loader + normalizer (with cross-pressure anomaly
                      detection) + reverseCurve helper
  src/prediction/     predictors (predictFlow/Power/Ctrl) +
                      groupPredictors (lazy group-scope views) +
                      OperatingPoint (pressure-driven prediction setpoints)
  src/drift/          DriftAssessor (per-metric drift) + PredictionHealth
                      (composes flow/power/pressure into HealthStatus +
                      confidence sibling — see OPEN_QUESTIONS 2026-05-10)
  src/pressure/       VirtualPressureChildren (dashboard-sim) +
                      PressureInitialization (real-vs-virtual tracking) +
                      PressureRouter (dispatches by position)
  src/state/          stateBindings (state.emitter listener helper) +
                      isOperationalState
  src/measurement/    measurementHandlers (dispatcher for flow/power/temp/pressure)
  src/flow/           flowController (handleInput body — execSequence,
                      execMovement, flowMovement, emergencystop)
  src/display/        workingCurves (showWorkingCurves + showCoG admin)
  src/commands/       canonical names: set.mode, cmd.startup/shutdown/estop,
                      set.setpoint, set.flow-setpoint,
                      data.simulate-measurement, query.curves, query.cog,
                      child.register. execSequence demuxes by payload.action
                      to canonical cmd.* handlers.
  CONTRACT.md         inputs/outputs/events/children surface

110 basic tests pass (100 new + 10 pre-existing).
specificClass.js / nodeClass.js untouched — integration in P5 wave 2.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/flow/flowController.js

@@ -0,0 +1,85 @@
+/**
+ * Dispatches inbound control actions (execSequence / execMovement /
+ * flowMovement / emergencyStop / enter|exitMaintenance / statusCheck)
+ * to the state machine and motion helpers on the host.
+ *
+ * Behaviour mirrors the original specificClass.handleInput exactly:
+ * - actions are lower-cased
+ * - mode/source gating runs first
+ * - flow-setpoints are unit-converted (output -> canonical) before
+ *   calcCtrl + setpoint
+ * - thrown errors are caught + logged (no re-throw) so a misbehaving
+ *   parent never crashes the FSM
+ */
+
+class FlowController {
+  constructor(ctx) {
+    if (!ctx || !ctx.host) {
+      throw new Error('FlowController: ctx.host is required');
+    }
+    this.host = ctx.host;
+    this.logger = ctx.logger || ctx.host.logger;
+  }
+
+  async handle(source, action, parameter) {
+    const host = this.host;
+
+    if (typeof action !== 'string') {
+      this.logger.error('Action must be string');
+      return;
+    }
+    action = action.toLowerCase();
+
+    if (!host.isValidActionForMode(action, host.currentMode)) return;
+    if (!host.isValidSourceForMode(source, host.currentMode)) return;
+
+    this.logger.info(
+      `Handling input from source '${source}' with action '${action}' in mode '${host.currentMode}'.`,
+    );
+
+    try {
+      switch (action) {
+        case 'execsequence':
+          return await host.executeSequence(parameter);
+
+        case 'execmovement':
+          return await host.setpoint(parameter);
+
+        case 'entermaintenance':
+        case 'exitmaintenance':
+          return await host.executeSequence(parameter);
+
+        case 'flowmovement': {
+          const canonicalFlowSetpoint = host._convertUnitValue(
+            parameter,
+            host.unitPolicy.output.flow,
+            host.unitPolicy.canonical.flow,
+            'flowmovement setpoint',
+          );
+          const pos = host.calcCtrl(canonicalFlowSetpoint);
+          return await host.setpoint(pos);
+        }
+
+        case 'emergencystop':
+          this.logger.warn(`Emergency stop activated by '${source}'.`);
+          return await host.executeSequence('emergencystop');
+
+        case 'statuscheck':
+          this.logger.info(
+            `Status Check: Mode = '${host.currentMode}', Source = '${source}'.`,
+          );
+          break;
+
+        default:
+          this.logger.warn(`Action '${action}' is not implemented.`);
+          break;
+      }
+      this.logger.debug(`Action '${action}' successfully executed`);
+      return { status: true, feedback: `Action '${action}' successfully executed.` };
+    } catch (error) {
+      this.logger.error(`Error handling input: ${error}`);
+    }
+  }
+}
+
+module.exports = FlowController;