All app and uvicorn logging now goes to logs/app.log (rotating,
10MB x5), and a catch-all exception handler logs full tracebacks there
before returning a generic 500 — so an error is traceable to its cause
without depending on how the process was launched. logs/ is gitignored,
like the other runtime artifacts.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
