Run status meanings
- Success — the task started and finished normally.
- Error — a fatal PHP error killed the task mid-run (captured by the shutdown guard).
- Stalled — the task ran longer than the stall threshold and was force-closed by the sweep.
- Skipped — a guarded task was already running, so this overlapping copy was cancelled.
- Running — the task is in progress right now (or a request ended before it finished).