Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@oxapy/__init__.py`:
- Line 18: Add an inline Ruff suppression for F403 to the wildcard import in
__init__.py, or replace it with explicit re-exports from oxapy. Preserve the
package’s existing public exports and follow the file’s established inline
suppression style.
- Around line 82-150: Update the non-zero exit branch in _run_supervisor so it
logs the worker_process.returncode before waiting for reload_requested. Preserve
the existing restart behavior and wait semantics, while clearly indicating that
the worker exited and the supervisor is waiting for a file change.
- Around line 334-347: Update the exception raises and Response return in the
file-serving flow to use the file’s established `# ty:ignore` convention instead
of `# type:ignore`, matching the existing annotations and the migration applied
near line 219. Preserve any necessary diagnostic code while making all three
affected annotations consistent.
- Line 52: Rename the set_watch_dir parameter dir to a non-shadowing name,
update all references within the method, and apply the same parameter rename in
the corresponding set_watch_dir declaration in the .pyi stub to keep the APIs
synchronized.

In `@tests/app.py`:
- Line 9: Update the main function signature in tests/app.py to include the None
return type annotation, making it def main() -> None while preserving its
existing implementation.
- Line 16: Guard the main() call with an if __name__ == "__main__" entrypoint
check so importing tests.app does not start the server; preserve direct script
execution behavior.
- Around line 4-6: Update the greet handler and health route in tests/app.py to
use explicit typed request handlers: make greet accept request as its first
parameter and annotate it with Request, and replace the health lambda with a
named health(request: Request) -> str function. Preserve both routes’ existing
response behavior.

---

Outside diff comments:
In `@src/lib.rs`:
- Around line 439-481: The server shutdown state is split between
HttpServer::running and the flag owned by ShutDownSignal, so Ctrl+C does not
stop the accept loop. Update setup_serve and the ShutDownSignal construction to
share HttpServer::running, or otherwise have the shutdown handler set that
existing flag, ensuring spawn_connection_handler observes false and stops
accepting connections.

---

Nitpick comments:
In `@Cargo.toml`:
- Around line 18-26: Update the pyo3-stub-gen dependency in the [dependencies]
section to use the compatible crates.io 0.22.x release instead of tracking the
main branch; preserve its existing default-features and feature settings, and
only use a pinned git commit if a registry release cannot be used.