story-kit: create 71_bug_server_health_endpoint_missing

.story_kit/work/1_upcoming/71_bug_server_health_endpoint_missing.md

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+# Bug 71: Server health endpoint missing
+
+## Description
+
+GET /api/health returns 404 not found. The server should have a health check endpoint that returns a 200 OK response so monitoring tools and scripts can verify the server is running.
+
+## How to Reproduce
+
+1. Start the story-kit server
+2. curl http://localhost:3001/api/health
+3. Observe 404 not found response
+
+## Actual Result
+
+404 not found
+
+## Expected Result
+
+200 OK with a simple health status response (e.g. {"status": "ok"})
+
+## Acceptance Criteria
+
+- [ ] Bug is fixed and verified