You are reviewing a pull request in this repository.

The change is the diff `main...feature/review-me` (run `git diff main...feature/review-me` to see it; the feature branch is already checked out).

Delegate the entire review to exactly ONE subagent. Give the subagent the task of reviewing that diff for correctness, security, data-handling and error-handling problems. Do not review the code yourself in the main session and do not start more than one subagent.

Rules:
- Read-only. Do not modify, create, or delete any files. Do not commit, push, or open a PR. Do not use the network.
- You may run the existing tests (`python -m unittest discover -s tests`) if useful.

When the subagent finishes, report its findings as a numbered list. One finding per item, in this exact format:

`N. path/to/file.py:LINE — issue (one sentence) — severity: high | medium | low`

After the list, print one line: `TOTAL FINDINGS: <number>`.
Do not add any other commentary.