OperationalAlert loggt critical + Best-Effort-Mail an MONITORING_ALERT_EMAIL
(Fallback LEGAL_CONTACT_EMAIL, feature-flagged). Alle 6 Scheduler-Tasks mit
onFailure, Queue::failing-Listener; .env.example: LOG_STACK=daily als Prod-Soll.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>