fix: stricter filtering of themes

planning_ai/nodes/map_node.py

@@ -36,11 +36,7 @@ def retrieve_themes(state: DocumentState) -> DocumentState:
     except Exception as e:
         logger.error(f"Theme selection error: {e}")
         themes = []
-    state["themes"] = [d for d in themes if d["score"] > 2]
-    score = np.mean([theme["score"] for theme in state["themes"]])
-    if score < 3:
-        state["processed"] = True
-        state["failed"] = True
+    state["themes"] = [d for d in themes if d["score"] >= 4]
     return state