✨ feat: add commit_message and bdd_testing skills

- Create commit_message skill with Gitmoji validation and templates
- Update bdd_testing skill to match validated BDD implementation
- Add comprehensive documentation and validation scripts
- Ensure all skills follow AGENTS.md conventions

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

.vibe/skills/bdd_testing/references/REFERENCE.md

@@ -0,0 +1,50 @@
+# bdd-testing Reference
+
+## Overview
+
+Detailed technical reference for the bdd-testing skill.
+
+## Key Concepts
+
+### [Concept 1]
+
+[Detailed explanation]
+
+### [Concept 2]
+
+[Detailed explanation]
+
+## API Reference
+
+### [Function/Method Name]
+
+**Description**: [What it does]
+
+**Parameters**:
+-  - [Type]: [Description]
+-  - [Type]: [Description]
+
+**Returns**: [Return type and description]
+
+**Example**:
+```bash
+[example usage]
+```
+
+## Troubleshooting
+
+### [Issue 1]
+
+**Symptoms**: [What the user sees]
+
+**Cause**: [Root cause]
+
+**Solution**: [How to fix it]
+
+### [Issue 2]
+
+**Symptoms**: [What the user sees]
+
+**Cause**: [Root cause]
+
+**Solution**: [How to fix it]