docs: add docs to CB

Pretty much every class and method should have documentation now.

ref: N25B-295

src/control_backend/agents/base.py

@@ -5,8 +5,13 @@ from control_backend.core.agent_system import BaseAgent as CoreBaseAgent
 
 class BaseAgent(CoreBaseAgent):
     """
-    Base agent class for our agents to inherit from. This just ensures
-    all agents have a logger.
+    The primary base class for all implementation agents.
+
+    Inherits from :class:`control_backend.core.agent_system.BaseAgent`.
+    This class ensures that every agent instance is automatically equipped with a
+    properly configured ``logger``.
+
+    :ivar logger: A logger instance named after the agent's package and class.
     """
 
     logger: logging.Logger