post-infra-modification-verification-checklist

After any infrastructure modification (process kills, cron changes, log rotation config), the stop hook requires: (1) crontab -l verification and recent execution log check, (2) ps aux to confirm killed processes did not respawn via systemd, (3) /tmp cleanup of audit residue, (4) documentation update in operations.md. Skipping these triggers the quality gate and blocks session close.