fix: Increase Node memory limit for CI tests

- Set NODE_OPTIONS --max_old_space_size=4096 (4GB)
- Remove --runInBand (was causing OOM with serial execution)
- Parallel execution with more memory should work better

Author: michaeloboyle

.github/workflows/ci.yml

@@ -32,10 +32,10 @@ jobs:
       run: npm run build
 
     - name: Run tests
-      run: npm test -- --runInBand
+      run: NODE_OPTIONS="--max_old_space_size=4096" npm test
 
     - name: Check test coverage
-      run: npm run test:coverage -- --runInBand
+      run: NODE_OPTIONS="--max_old_space_size=4096" npm run test:coverage
 
     - name: Upload coverage to Codecov
       if: matrix.node-version == '20.x'