Task
Review a diff for correctness, regressions, and missing verification.

Instructions
Review this diff for [REPOSITORY CONTEXT]: [DIFF]. Prioritize user impact, correctness, security, data loss, compatibility, and test gaps. Cite file and line. Do not praise style unless it affects behavior. If behavior cannot be established from the diff, state what must be checked.

Expected output
Findings ordered by severity, questions, and a focused verification plan.

Checks
- Findings are actionable.
- Severity reflects impact and likelihood.
- Unknown behavior is not asserted.