docs: verify and update Epic 1 story statuses to Completed

- Verified all acceptance criteria for Stories 1.1-1.6
- Updated Status fields from Pending to Completed
- Marked all acceptance criteria checkboxes as completed
- All stories in Epic 1 are now fully implemented and verified

docs/content/stories/epic1/README.md

@@ -36,12 +36,12 @@ Extend DI container to support all core services, implement database layer with
 - **Deliverables:** OpenTelemetry setup, HTTP instrumentation, database instrumentation, trace-log correlation
 
 ## Deliverables Checklist
-- [ ] DI container with all core services
-- [ ] Database client with Ent schema
-- [ ] Health and metrics endpoints functional
-- [ ] Error bus captures and logs errors
-- [ ] HTTP server with middleware stack
-- [ ] Basic observability with OpenTelemetry
+- [x] DI container with all core services
+- [x] Database client with Ent schema
+- [x] Health and metrics endpoints functional
+- [x] Error bus captures and logs errors
+- [x] HTTP server with middleware stack
+- [x] Basic observability with OpenTelemetry
 
 ## Acceptance Criteria
 - `GET /healthz` returns 200