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/basics/fridolin.meta.json

@@ -0,0 +1,11 @@
+{
+  "icon": "🦊",
+  "title": "Fridolin (Pfadfinder)",
+  "description": "Lerne Navigation im Dateisystem: pwd, ls, cd",
+  "category": "basics",
+  "difficulty": "beginner",
+  "duration_minutes": 5,
+  "enabled": true,
+  "author": "Crumbforest Team",
+  "version": "2.0"
+}