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>

packages/opencode/package.json

@@ -4,7 +4,9 @@
   "name": "opencode",
   "type": "module",
   "private": true,
-  "scripts": {},
+  "scripts": {
+    "typecheck": "tsc --noEmit"
+  },
   "exports": {
     "./*": [
       "./src/*.ts",