P2 wave 1: extract concerns from pumpingStation specificClass

Splits pumpingStation/src/ into focused concern modules. specificClass.js
will be slimmed to an orchestrator in P2.9 (integration); for now both
the inlined logic AND the new modules coexist so tests stay green
throughout.

  src/basin/         BasinGeometry + thresholdValidator (pure)
  src/measurement/   flowAggregator + measurementRouter + calibration
  src/control/       levelBased + flowBased(stub) + manual + index dispatcher
  src/safety/        safetyController split into dryRun + overfill rules
  src/commands/      registry array + handlers (canonical names from start)
  src/editor.js      260 lines of SVG basin-diagram redraw, was inline in .html
  examples/standalone-demo.js  was if(require.main===module) at bottom of specificClass.js
  CONTRACT.md        canonical inputs + outputs + emitted events

Modified:
  src/specificClass.js  removed the 170-line standalone demo block
  pumpingStation.html   oneditprepare/oneditsave delegate to editor.{init,save}
  pumpingStation.js     added admin endpoint serving src/editor.js

102 basic tests pass (60 new + 42 existing).
specificClass.js itself is unchanged in behaviour — integration is P2.9.

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

test/basic/control-manual.basic.test.js

@@ -0,0 +1,64 @@
+// Unit tests for the manual control strategy.
+// Run with: node --test test/basic/control-manual.basic.test.js
+
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const manual = require('../../src/control/manual');
+
+function makeGroup(name) {
+  const calls = { handleInput: [] };
+  return {
+    config: { general: { name } },
+    handleInput: async (...args) => { calls.handleInput.push(args); },
+    _calls: calls,
+  };
+}
+
+function makeMachine(name) {
+  const calls = { handleInput: [] };
+  return {
+    config: { general: { name } },
+    handleInput: async (...args) => { calls.handleInput.push(args); },
+    _calls: calls,
+  };
+}
+
+function makeLogger() {
+  return { info: () => {}, debug: () => {}, warn: () => {}, error: () => {} };
+}
+
+test('forwardDemand calls handleInput("parent", demand) on every machine group', async () => {
+  const groups = { a: makeGroup('A'), b: makeGroup('B'), c: makeGroup('C') };
+  const ctx = { machineGroups: groups, machines: {}, logger: makeLogger() };
+
+  await manual.forwardDemand(ctx, 50);
+
+  for (const g of Object.values(groups)) {
+    assert.equal(g._calls.handleInput.length, 1);
+    assert.deepEqual(g._calls.handleInput[0], ['parent', 50]);
+  }
+});
+
+test('forwardDemand with no machineGroups but direct machines splits demand evenly', async () => {
+  const machines = { m1: makeMachine('M1'), m2: makeMachine('M2'), m3: makeMachine('M3'), m4: makeMachine('M4') };
+  const ctx = { machineGroups: {}, machines, logger: makeLogger() };
+
+  await manual.forwardDemand(ctx, 80);
+
+  for (const m of Object.values(machines)) {
+    assert.equal(m._calls.handleInput.length, 1);
+    assert.deepEqual(m._calls.handleInput[0], ['parent', 'execMovement', 20]);
+  }
+});
+
+test('run() is a no-op (manual mode is event-driven)', async () => {
+  const groups = { a: makeGroup('A') };
+  const ctx = { machineGroups: groups, machines: {}, logger: makeLogger() };
+  await manual.run(ctx, { percControl: 0 });
+  assert.equal(groups.a._calls.handleInput.length, 0);
+});
+
+test('manual exports name === "manual"', () => {
+  assert.equal(manual.name, 'manual');
+});