perf: keywords nodes do not use Pydantic structured output

app.py

@@ -98,7 +98,8 @@ def classify_individual_topic(topic_name: str):
         # Enforce JSON list output natively
         #result = structured_llm.invoke(prompt.format(title=state["title"], abstract=state["abstract"], sub_tree=target_sub_tree))
         result = llm.invoke(prompt.format(title=state["title"], abstract=state["abstract"], sub_tree=target_sub_tree))
-        raw_keywords = [k.strip() for k in result.keywords if k.strip()]
+        #raw_keywords = [k.strip() for k in result.keywords if k.strip()]
+        raw_keywords = [k.strip() for k in result.content.split(",") if k.strip()]
         
         # Immediate validation pass inside the node branch
         valid_set = set()