Bootstrap project and safe work-item workflow

delivery_backlog/stories/US02-04-job-api-events.md

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+# US02-04 — Expose Job APIs and Activity Events
+
+Epic: [E02](../E02-unified-workflow-shell.md)
+
+As a frontend client, I want versioned job commands, status APIs, and activity events
+so the browser can operate workflows without HTML responses or internal imports.
+
+## Acceptance criteria
+
+- `/api/v1` exposes typed job start, status, cancel, blocker, and event contracts.
+- Operational endpoints return JSON; the event endpoint returns SSE with resumable IDs.
+- SSE reconnects without duplicate/lost durable events and polling is sufficient as a
+  fallback.
+- Errors use the shared JSON envelope and correct status codes, including `409`.
+
+## Automated tests
+
+- OpenAPI/contract tests validate schemas, status codes, errors, and content types.
+- Black-box tests cover SSE disconnect/reconnect, polling, idempotency, and cancellation.
+
+## Dependencies
+
+- US02-02, US02-03