Verify before done
- Identify the exact command or observation that proves each claim.
- Run it fresh after the final edit.
- Read the complete exit status and relevant output; do not infer one check from another.
- For a bug fix, reproduce the original symptom or run a regression test that exercises it.
- Reconcile the implementation against every requested requirement, not only the passing tests.
- Report the evidence and any check that could not be run. Never replace missing evidence with confidence language.