🤖 chore: finalize Git hooks implementation and documentation

- Complete Git hooks setup with staged-only formatting
- Add comprehensive documentation and ADR
- Fix BDD step template syntax error
- Update commit_message skill with hooks integration
- Verify all hooks work correctly

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

.vibe/skills/commit_message/SKILL.md

@@ -88,7 +88,7 @@ The project includes Git hooks that automatically run before commits to ensure c
 - **Location**: `.git/hooks/pre-commit`
 - **Automatically runs**:
   - `go mod tidy` - Cleans up and organizes Go dependencies
-  - `go fmt` - Formats all Go code according to standards
+  - `go fmt` - Formats staged Go files according to standards
   - Auto-adds modified files to the commit
 
 ### How It Works