refactor: replace custom test runner with Node.js assert

- Simplify test files by removing custom TestRunner class
- Use standard Node.js assert module across all unit tests
- Update CLAUDE.md with streamlined development instructions
- Update tests/README.md with current testing approach
- Reduce boilerplate in delegation and GLMT test suites (652 lines removed)

package.json

@@ -58,10 +58,10 @@
     "lint:fix": "eslint src/ --fix",
     "format": "prettier --write src/",
     "format:check": "prettier --check src/",
-    "validate": "bun run typecheck && bun run lint && bun run format:check && bun run test",
+    "validate": "bun run typecheck && bun run lint:fix && bun run format:check && bun run test",
     "test": "bun run build && bun run test:all",
     "test:all": "bun run test:unit && bun run test:npm",
-    "test:unit": "mocha tests/shared/unit/**/*.test.js --timeout 5000",
+    "test:unit": "mocha 'tests/**/unit/**/*.test.js' 'tests/unit/**/*.test.js' --timeout 5000",
     "test:npm": "mocha tests/npm/**/*.test.js --timeout 10000",
     "test:native": "bash tests/native/unix/edge-cases.sh",
     "test:edge-cases": "bash tests/edge-cases.sh",