Add ?ModuleEventDispatcher to SchedulerRunService (fail-open, nullable).
Dispatch scheduler.job_failed event when a job fails with payload:
job_id, job_key, label, error_code, error_message, trigger_type.
New SchedulerJobFailedNotificationListener in notifications module
creates in-app admin notifications for users with JOBS_MANAGE
permission, scoped per tenant, with 30-min dedup per job_key.
Also fixes audit module manifest: system_audit_purge job_key was
mismatched (audit_system_purge vs system_audit_purge in DB).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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