feat: architecture refactor — validators, positions, menuUtils, ESLint, tests, CI

Major improvements across the codebase:

- Extract validationUtils.js (548→217 lines) into strategy pattern validators
- Extract menuUtils.js (543→35 lines) into 6 focused menu modules
- Adopt POSITIONS constants across 23 files (183 replacements)
- Eliminate all 71 ESLint warnings (0 errors, 0 warnings)
- Add 158 unit tests for ConfigManager, MeasurementContainer, ValidationUtils
- Add architecture documentation with Mermaid diagrams
- Add CI pipeline (Docker, ESLint, Jest, Makefile)
- Add E2E infrastructure (docker-compose.e2e.yml)

Test results: 377 total (230 Jest + 23 node:test + 124 legacy), all passing
Lint: 0 errors, 0 warnings

Closes #2, #3, #9, #13, #14, #18

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -25,8 +25,26 @@
   },
   "author": "Rene De Ren, Pim Moerman, Janneke Tack, Sjoerd Fijnje, Dieke Gabriels, pieter van der wilt",
   "license": "SEE LICENSE",
+  "scripts": {
+    "preinstall": "node scripts/patch-deps.js",
+    "postinstall": "git checkout -- package.json 2>/dev/null || true",
+    "test": "jest --forceExit",
+    "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",
+    "lint": "eslint nodes/",
+    "lint:fix": "eslint nodes/ --fix",
+    "ci": "npm run lint && npm run test:all",
+    "test:e2e": "bash test/e2e/run-e2e.sh"
+  },
   "dependencies": {
-    "generalFunctions": "git+https://gitea.centraal.wbd-rd.nl/RnD/generalFunctions.git",
+    "generalFunctions": "file:nodes/generalFunctions",
     "mathjs": "^13.2.0"
+  },
+  "devDependencies": {
+    "@eslint/js": "^8.57.0",
+    "eslint": "^8.57.0",
+    "globals": "^15.0.0",
+    "jest": "^29.7.0"
   }
 }