tools/server/el3ab-cron.sh runs api/cron.php (player app) and the manager's
api/cron/notifications under flock, logging only failures. Installed on
169.58.165.0 as /usr/local/bin/el3ab-cron.sh with /etc/cron.d/el3ab-cron;
the service key lives in /etc/el3ab-cron.headers (root, 600).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>