Add complete Crumbforest mission system

- Interactive mission selector with metadata-driven design
- 5 educational missions (basics + advanced)
- AI assistant roles (Deepbit, Bugsy, Schnippsi, Tobi)
- SnakeCam gesture recognition system
- Token tracking utilities
- CLAUDE.md documentation
- .gitignore for logs and secrets

missions/advanced/ssh_security.meta.json

@@ -0,0 +1,11 @@
+{
+    "icon": "🔐",
+    "title": "SSH Security Basics",
+    "description": "Lerne sichere SSH-Verbindungen und Key-Management",
+    "category": "advanced",
+    "difficulty": "intermediate",
+    "duration_minutes": 12,
+    "enabled": true,
+    "author": "Crumbforest Team",
+    "version": "2.0"
+}