chore: apply suggestion

Changed `add_background_task` to `add_behavior` and added extra docs.

src/control_backend/core/agent_system.py

@@ -1,6 +1,7 @@
 import asyncio
 import logging
 from abc import ABC, abstractmethod
+from collections.abc import Coroutine
 from dataclasses import dataclass
 
 # Central directory to resolve agent names to instances
@@ -69,7 +70,7 @@ class BaseAgent(ABC):
         await self.setup()
 
         # Start processing inbox
-        await self.add_background_task(self._process_inbox())
+        await self.add_behavior(self._process_inbox())
 
     async def stop(self):
         """Stops the agent."""
@@ -98,8 +99,13 @@ class BaseAgent(ABC):
         """Override this to handle incoming messages."""
         raise NotImplementedError
 
-    async def add_background_task(self, coro):
-        """Helper to add a behavior to the agent."""
+    async def add_behavior(self, coro: Coroutine):
+        """
+        Helper to add a behavior to the agent. To add asynchronous behavior to an agent, define
+        an `async` function and add it to the task list by calling :func:`add_background_task`
+        with it. This should happen in the :func:`setup` method of the agent. For an example, see:
+        :func:`~control_backend.agents.bdi.BDICoreAgent`.
+        """
         task = asyncio.create_task(coro)
         self._tasks.add(task)
         task.add_done_callback(self._tasks.discard)