Add Vitest test suite with 10 tests

- Tests cover: health, read-only enforcement (POST/PUT/PATCH/DELETE blocked),
  security headers, content type validation
- Update CI workflow to run tests
- Add test scripts to package.json

Author: rolandfarkasCOM

.github/workflows/ci.yml

@@ -19,5 +19,7 @@ jobs:
       - run: npm ci
       - name: TypeScript check
         run: npm run typecheck
+      - name: Tests
+        run: npm test
       - name: Security audit
         run: npm audit --audit-level=high

.gitignore

@@ -33,3 +33,8 @@ Thumbs.db
 # Logs
 *.log
 npm-debug.log*
+
+# Claude Code project files
+CLAUDE.md
+.claude/
+tasks/