fix: complete pipeline working

User interrupts still need to be tested.

ref: N25B-429

src/control_backend/core/agent_system.py

@@ -131,6 +131,7 @@ class BaseAgent(ABC):
         :param message: The message to send.
         """
         target = AgentDirectory.get(message.to)
+        message.sender = self.name
         if target:
             await target.inbox.put(message)
             self.logger.debug(f"Sent message {message.body} to {message.to} via regular inbox.")