Fix TypeScript errors and clean up unused imports

- Remove unused fs import from app.ts
- Remove unused LLM import and missing module reference from server.ts
- Fix parameter naming inconsistency in fetch.ts execute function
- Add missing metadata property to fetch.ts return statement
- Update test file to use correct API signatures and parameter names
- Remove unused parameters from example.ts

🤖 Generated with opencode
Co-Authored-By: opencode <noreply@opencode.ai>

package.json

@@ -5,6 +5,7 @@
   "type": "module",
   "packageManager": "bun@1.2.14",
   "scripts": {
+    "typecheck": "bun run typecheck --filter='*'",
     "dev": "sst dev"
   },
   "workspaces": {