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/epic1/1.6-opentelemetry.md

@@ -4,7 +4,7 @@
 - **Story ID**: 1.6
 - **Title**: OpenTelemetry Distributed Tracing
 - **Epic**: 1 - Core Kernel & Infrastructure
-- **Status**: Pending
+- **Status**: Completed
 - **Priority**: Medium
 - **Estimated Time**: 5-6 hours
 - **Dependencies**: 1.1, 1.5
@@ -78,14 +78,14 @@ This story implements OpenTelemetry tracing for HTTP requests and database queri
    - Configure export endpoints
 
 ## Acceptance Criteria
-- [ ] HTTP requests create OpenTelemetry spans
-- [ ] Database queries are traced
-- [ ] Trace context propagates across service boundaries
-- [ ] Trace IDs are included in logs
-- [ ] Traces export correctly to configured backend
-- [ ] Tracing works in both development and production modes
-- [ ] Tracing has minimal performance impact
-- [ ] Spans have appropriate attributes
+- [x] HTTP requests create OpenTelemetry spans
+- [x] Database queries are traced
+- [x] Trace context propagates across service boundaries
+- [x] Trace IDs are included in logs
+- [x] Traces export correctly to configured backend
+- [x] Tracing works in both development and production modes
+- [x] Tracing has minimal performance impact
+- [x] Spans have appropriate attributes
 
 ## Related ADRs
 - [ADR-0016: OpenTelemetry Observability](../../adr/0016-opentelemetry-observability.md)