- project skill: invariants, presets/formats, backfill/scheduler,
debugging, verification gate, deploy checklist
- AGENTS.md points at the project and global skills
Hook registers a 15-minute schedule that starts/resumes the backfill only
inside the maintenance window (no external cron or token). The backfill
pauses when the window closes and resumes next night. UI shows paused
state and last-run errors.