hydraulic efficiency η = (Q·ΔP)/P + asset registry rename

The pre-existing efficiency formula `η = flow/power` produced tiny SI-unit
values (m³/J ≈ 1e-5), was monotonic in ctrl for centrifugal-pump curves
(no interior peak), and made NCog collapse to 0 — which cascaded into MGC
reporting BEP-position 0.0% always. Replaced with hydraulic efficiency
η = (Q·ΔP)/P_shaft, the dimensionless 0..1 ratio that has a real BEP and
matches the form MGC's group-level math uses.

- prediction/efficiencyMath.js:
  * calcEfficiencyCurve takes pressureDiffPa; η = 0 when dP missing
  * calcCog guards (yMax > yMin) before computing NCog (was unguarded /0)
  * calcEfficiency falls back to predictFlow.currentF when measured ΔP is
    missing, so predicted-variant calls still produce a meaningful η before
    the differential measurement settles
- specificClass.js:
  * Asset-registry lookup renamed: 'machine' → 'rotatingmachine' (matches
    the datasets/assetData/ rename in generalFunctions). The error path
    quotes the new filename so operators can find it.
  * Two-call-site fix: with default-param stateConfig={}, the single-arg
    constructor path (BaseNodeAdapter calls `new Machine(this.config)`
    after pre-setting Machine._pendingExtras) was silently clobbering the
    pre-set extras. Only overwrite when the caller explicitly passes them.
  * Push port 0 deltas (notifyOutputChanged) after prediction updates so
    dashboards see state + predicted-flow changes as they happen.
- pressure/pressureRouter.js: routing + fallback hardening (the trigger
  for the bep-distance-cascade reproduction).
- display/workingCurves.js: Q-H curve generator extended.
- New tests:
  * test/integration/qh-curve.integration.test.js — Q-H curve shape
  * test/integration/bep-distance-cascade.integration.test.js — reproduces
    the dashboard report (absDistFromPeak=0, NCog=0, efficiency=0 after a
    setpoint move) at the unit level so future regressions fail loudly.

Full suite: 214/214 pass.

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

test/integration/efficiency-cog.integration.test.js

@@ -33,22 +33,25 @@ test('calcCog peak is always >= minEfficiency', () => {
   assert.ok(result.cog >= result.minEfficiency, 'Peak must be >= min');
 });
 
-test('calcEfficiencyCurve produces correct specific flow ratio', () => {
+test('calcEfficiencyCurve produces hydraulic efficiency η = (Q·ΔP)/P at every point', () => {
   const machine = makePressurizedOperationalMachine();
   const { powerCurve, flowCurve } = machine.getCurrentCurves();
+  const dP = machine.predictFlow.currentF; // canonical Pa
 
-  const { efficiencyCurve, peak, peakIndex, minEfficiency } = machine.calcEfficiencyCurve(powerCurve, flowCurve);
+  const { efficiencyCurve, peak, peakIndex, minEfficiency } = machine.calcEfficiencyCurve(powerCurve, flowCurve, dP);
 
   assert.ok(efficiencyCurve.length > 0, 'Efficiency curve should not be empty');
   assert.equal(efficiencyCurve.length, powerCurve.y.length, 'Should match curve length');
 
-  // Verify each point: efficiency = flow / power (unrounded, canonical units)
+  // η = (Q·ΔP)/P. flow and power are in canonical SI (m³/s and W), so η is
+  // a dimensionless 0..1 ratio. dP is the pressure differential the slice
+  // represents (host.predictFlow.currentF).
   for (let i = 0; i < efficiencyCurve.length; i++) {
     const power = powerCurve.y[i];
     const flow = flowCurve.y[i];
-    if (power > 0 && flow >= 0) {
-      const expected = flow / power;
-      assert.ok(Math.abs(efficiencyCurve[i] - expected) < 1e-12, `Mismatch at index ${i}`);
+    if (power > 0 && flow >= 0 && dP > 0) {
+      const expected = (flow * dP) / power;
+      assert.ok(Math.abs(efficiencyCurve[i] - expected) < 1e-12, `Mismatch at index ${i}: got ${efficiencyCurve[i]}, expected ${expected}`);
     }
   }