update

backend/paths.py

@@ -21,6 +21,11 @@ def bausteine_path(topic: str) -> Path:
     return topic_dir(topic) / "bausteine.md"
 
 
+def subbausteine_path(topic: str) -> Path:
+    """Sidecar: pro Baustein die Subbausteine mit Stufe (von allen Guides geteilt)."""
+    return topic_dir(topic) / "subbausteine.json"
+
+
 def guide_content_path(topic: str, format_name: str) -> Path:
     return topic_dir(topic) / "guides" / f"{format_name}.json"