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>

test/basic/groupPredictors.basic.test.js

@@ -0,0 +1,51 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const { predict } = require('generalFunctions');
+const { buildPredictors } = require('../../src/prediction/predictors');
+const { buildGroupPredictors } = require('../../src/prediction/groupPredictors');
+
+function makeCanonicalCurve() {
+  return {
+    nq: {
+      100000: { x: [0, 50, 100], y: [0, 0.005, 0.01] },
+      120000: { x: [0, 50, 100], y: [0, 0.006, 0.012] },
+    },
+    np: {
+      100000: { x: [0, 50, 100], y: [0, 500, 1000] },
+      120000: { x: [0, 50, 100], y: [0, 600, 1200] },
+    },
+  };
+}
+
+test('buildGroupPredictors: returns null when source predictors absent', () => {
+  assert.equal(buildGroupPredictors(null), null);
+  assert.equal(buildGroupPredictors({ predictFlow: null, predictPower: null, predictCtrl: null }), null);
+});
+
+test('buildGroupPredictors: returns three group-scope Predict instances', () => {
+  const predictors = buildPredictors(makeCanonicalCurve());
+  const group = buildGroupPredictors(predictors);
+  assert.ok(group);
+  assert.ok(group.groupPredictFlow instanceof predict);
+  assert.ok(group.groupPredictPower instanceof predict);
+  assert.ok(group.groupPredictCtrl instanceof predict);
+});
+
+test('buildGroupPredictors: group instances share input curves with individuals', () => {
+  const predictors = buildPredictors(makeCanonicalCurve());
+  const group = buildGroupPredictors(predictors);
+  // Predict._adoptInputsFrom copies these refs from the source.
+  assert.equal(group.groupPredictFlow.inputCurve, predictors.predictFlow.inputCurve);
+  assert.equal(group.groupPredictPower.inputCurve, predictors.predictPower.inputCurve);
+  assert.equal(group.groupPredictCtrl.inputCurve, predictors.predictCtrl.inputCurve);
+});
+
+test('buildGroupPredictors: group operating-point state is independent of individual', () => {
+  const predictors = buildPredictors(makeCanonicalCurve());
+  const group = buildGroupPredictors(predictors);
+  predictors.predictFlow.fDimension = 100000;
+  group.groupPredictFlow.fDimension = 120000;
+  assert.equal(predictors.predictFlow.currentF, 100000);
+  assert.equal(group.groupPredictFlow.currentF, 120000);
+});