Bootstrap project and safe work-item workflow

delivery_backlog/stories/US02-03-worker-recovery.md

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+# US02-03 — Execute Jobs with Leases, Locks, and Recovery
+
+Epic: [E02](../E02-unified-workflow-shell.md)
+
+As an operator, I want workers to claim, cancel, and recover jobs safely so crashes or
+duplicate workers cannot corrupt state.
+
+## Acceptance criteria
+
+- Workers use leases, heartbeats, fencing tokens, bounded queues, and typed lanes.
+- Cancellation is cooperative and leaves resumable or terminal item states.
+- Lock ordering prevents conflicting analysis, EXIF, rename, upload, and archive work.
+- A recovered job rejects late commits from its former worker.
+
+## Automated tests
+
+- Process tests kill workers, expire leases, recover jobs, and attempt stale commits.
+- Randomized concurrency tests assert no deadlocks, duplicate completion, or lost events.
+
+## Dependencies
+
+- US02-02