📝 docs: update existing ADRs with user authentication references

Updated existing Architecture Decision Records:
- Added user authentication references to ADR-0008 (BDD Testing)
- Updated ADR-0016 (CI/CD Pipeline) with authentication workflow
- Enhanced ADR-0017 (Trunk-based Development) with BDD integration
- Added security considerations to multiple ADRs
- Updated cross-references throughout documentation

Removed deprecated files:
- docker-compose.cicd-test.yml (replaced by docker-compose.yml)

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

adr/0003-zerolog-logging.md

@@ -6,7 +6,7 @@
 
 ## Context and Problem Statement
 
-We needed to choose a logging library for DanceLessonsCoach that provides:
+We needed to choose a logging library for dance-lessons-coach that provides:
 - High performance with minimal overhead
 - Structured logging capabilities
 - Multiple output formats (console, JSON)
@@ -94,7 +94,7 @@ Chosen option: "Zerolog" because it provides excellent performance, clean API, g
 | With fields | 3 alloc | 4 alloc |
 | Complex | 5 alloc | 6 alloc |
 
-### Real-World Impact for DanceLessonsCoach
+### Real-World Impact for dance-lessons-coach
 
 * **Performance**: <1μs difference per request - negligible impact
 * **Memory**: Zerolog's better allocation profile helps in long-running services