📝 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/0015-cli-subcommands-cobra.md

@@ -8,7 +8,7 @@
 
 ## Context
 
-As DanceLessonsCoach grows, we need a more robust and maintainable CLI structure. Currently, we use simple flag parsing (`--version`), but this approach has limitations:
+As dance-lessons-coach grows, we need a more robust and maintainable CLI structure. Currently, we use simple flag parsing (`--version`), but this approach has limitations:
 
 1. **Limited scalability**: Adding more commands/flags becomes messy
 2. **Poor user experience**: No built-in help, completion, or validation
@@ -51,10 +51,10 @@ We will adopt **Cobra** as our CLI framework. Cobra is a mature, widely-used lib
 ```go
 var rootCmd = &cobra.Command{
     Use:   "dance-lessons-coach",
-    Short: "DanceLessonsCoach - API server and CLI tools",
-    Long: `DanceLessonsCoach provides greeting services and API management.
+    Short: "dance-lessons-coach - API server and CLI tools",
+    Long: `dance-lessons-coach provides greeting services and API management.
 
-To begin working with DanceLessonsCoach, run:
+To begin working with dance-lessons-coach, run:
   dance-lessons-coach server --help`,
     SilenceUsage: true,
 }
@@ -69,7 +69,7 @@ var versionCmd = &cobra.Command{
 
 var serverCmd = &cobra.Command{
     Use:   "server",
-    Short: "Start the DanceLessonsCoach server",
+    Short: "Start the dance-lessons-coach server",
     Run: func(cmd *cobra.Command, args []string) {
         // Load config and start server
         cfg, err := config.LoadConfig()
@@ -116,7 +116,7 @@ func main() {
 
 **Current Commands:**
 - `version`: Print version information
-- `server`: Start the DanceLessonsCoach server
+- `server`: Start the dance-lessons-coach server
 - `greet [name]`: Greet someone by name
 - `help`: Built-in help system
 - `completion`: Shell completion scripts (automatic)