Stabilize frontend login. Make chat messages multiline.

backend/agent.py

@@ -34,8 +34,6 @@ class Agent:
     ]
     tools = []
 
-    # while this constructor accepts two parameters,
-    # all subclasses must also accept a fourth 'data' parameter
     def __init__(self, app, agent_id, data):
         self.app = app
         self.agent_id = agent_id