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 <[email protected]>

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