Bootstrap project and safe work-item workflow

delivery_backlog/stories/US02-02-durable-jobs.md

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+# US02-02 — Persist and Coordinate Durable Jobs
+
+Epic: [E02](../E02-unified-workflow-shell.md)
+
+As an operator, I want jobs and item progress stored durably so work can resume after
+browser, API, or worker interruption.
+
+## Acceptance criteria
+
+- Job, item, event, attempt, progress, cancellation, and terminal states are persisted.
+- Commands support idempotency keys and atomic state transitions.
+- Prerequisites and one-mutating-job policy produce explicit blockers.
+- Progress derives from durable item state rather than browser memory.
+
+## Automated tests
+
+- State-machine/property tests reject invalid transitions and duplicate terminal state.
+- Repository tests cover concurrent idempotent submission and restart persistence.
+
+## Dependencies
+
+- US01-02