Add complete Abenteuer-Schmiede BMAD module

- 7 specialized agents (Spielleiter, Weltenbauer, NSC-Schmied,
  Begegnungsdesigner, Regelwächter, Handout-Künstler, Partymodus)
- Kompendium-System (Single Source of Truth)
- DSA5-native with Proben, QS, Kampfwerte
- Interactive Partymodus for playtesting
- Balance analysis and rule checking
- Templates for NSCs, locations, scenes, encounters, handouts
- Export (Markdown, Print, VTT)

.gitignore

@@ -0,0 +1,22 @@
+# Generated output
+_bmad-output/szenen/
+_bmad-output/handouts/
+_bmad-output/export/
+
+# State files (project-specific)
+zustand/szenen/
+
+# System files
+.DS_Store
+Thumbs.db
+*.swp
+*.swo
+*~
+
+# IDE
+.vscode/
+.idea/
+
+# Dependencies
+node_modules/
+__pycache__/