cleanup-defensive

Remove try/catch and defensive null-checks that don't serve a real role. The goal is errors that propagate cleanly to the boundary that knows how to handle them, not silent fallbacks that hide bugs.

Core principle: catch only when you can do something more useful than the default propagation — and "log and rethrow" is rarely more useful than just letting it throw.

Preflight

1. Language detect: TS/JS, Python, Go (if err != nil patterns), Rust (unwrap_or/map_err chains that smell defensive).
2. Git state: refuse on dirty tree.
3. Report dir: ensure exists.
4. Identify boundary files — preserve catches in:
   • HTTP request handlers (app/api/, routes/, Hono/Express/FastAPI handlers)
   • CLI entry points (files with if __name__ == "__main__", bin/*, cmd/*)
   • Message/queue consumers (worker entry points, cron handlers)
   • Test files (test runners need failures localized)

Detect