P10.7: top-level test:platform runner + bump submodule pointers

scripts/test-platform.js iterates each submodule, runs npm test, shows
a per-node pass/fail summary, exits non-zero if any node fails.

Wired as `npm run test:platform` in the parent package.json.

Submodule pointer bumps:
  dashboardAPI     2874608 → 92d7eba  (Mocha → node:test conversion for edge+integration)
  diffuser         0ec9dd1 → 15cfb22  (P10.7a test script fix)
  generalFunctions 8ebf31d → 95c5e68  (P10.7a test script fix + remove 5 broken Mocha dupes)
  pumpingStation   52d3889 → d2384b1  (P10.7a test script fix)

Current platform-wide gate: 729 pass / 5 fail across 12 submodules
(5 failures are all pre-existing AssertionErrors logged in
OPEN_QUESTIONS.md for Phase 10.5).

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

package.json

@@ -44,6 +44,7 @@
     "test:node": "node --test nodes/valve/test/basic/*.test.js nodes/valve/test/edge/*.test.js nodes/valve/test/integration/*.test.js nodes/valveGroupControl/test/basic/*.test.js nodes/valveGroupControl/test/edge/*.test.js nodes/valveGroupControl/test/integration/*.test.js",
     "test:legacy": "node nodes/machineGroupControl/src/groupcontrol.test.js && node nodes/generalFunctions/src/nrmse/errorMetric.test.js",
     "test:all": "npm test && npm run test:node && npm run test:legacy",
+    "test:platform": "node scripts/test-platform.js",
     "test:e2e:reactor": "node scripts/e2e-reactor-roundtrip.js",
     "lint": "eslint nodes/",
     "lint:fix": "eslint nodes/ --fix",