fix(demos): Access entities attribute in InformationExtraction result

Fixes AttributeError: 'tuple' object has no attribute 'link'

- Iterate over .entities list instead of Result object directly
- Pydantic BaseModel iteration yields tuples, not objects
- Access entity attributes (.topic, .link) on each item
- Aligns with ResultMulti schema structure

Author: ivyleavedtoadflax

demos/demo_chatcontrol.py

@@ -245,8 +245,8 @@ def _(mo):
 
 @app.cell
 def _(result):
-    for article in result["InformationExtraction"]:
-        print(article)
+    for article in result["InformationExtraction"].entities:
+        print(article.topic)
         print(f"{article.link}")
         print("#######")
     return