ci: add test step to GitHub Actions workflow

Run bun test after build to verify integration tests

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: divideby0

.github/workflows/check.yaml

@@ -42,3 +42,6 @@ jobs:
 
       - name: Build project
         run: bun run build
+
+      - name: Run tests
+        run: bun test