Update agent.py

agent.py

@@ -499,7 +499,8 @@ class BERTopicAgent:
 
     def _update_downloads(self, text: str) -> None:
         """Scan agent text for downloadable artefact paths."""
-        found = re.findall(r'artifacts/[\w_]+\.(json|csv|txt|npy|html)', text)
+        # Added ?: to make it a non-capturing group
+        found = re.findall(r'artifacts/[\w_]+\.(?:json|csv|txt|npy|html)', text)
         new   = list(filter(lambda p: p not in self._downloads, found))
         self._downloads.extend(new)