feat: complete operator job actions (requeue/reject/cancel)
Adds lease-free operator lifecycle control to the fleet control plane:
- coordinator.operatorAction() fences any current factory holder by bumping
leaseEpoch (mirrors the reaper), preserves checkpoint, and routes the job:
requeue -> queued (or blocked if deps unmet), reject -> dead_letter,
cancel -> failed. Shipped jobs are terminal (invalid_state).
- POST /fleet/jobs/:id/actions/:action route (400 on unknown action)
- fleet-client.operatorAction() + Requeue/Cancel/Reject buttons on job detail
- Tests: +5 coordinator, +1 routes, +2 fleet-client (platform fleet 140 green,
tracker-web 212 green)
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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