refactor: agents inherit logger from BaseAgent

Created a class `BaseAgent`, from which all agents inherit. They get
assigned a logger with a nice name (something like
`control_backend.agents.AgentName`).

The BDI core takes care of its own logger, as bdi is still a module.

ref: N25B-241

src/control_backend/agents/__init__.py

@@ -1,4 +1,17 @@
+from .base import BaseAgent
 from .belief_collector.belief_collector import BeliefCollectorAgent
 from .llm.llm import LLMAgent
+from .ri_command_agent import RICommandAgent
 from .ri_communication_agent import RICommunicationAgent
-from .vad_agent import VADAgent
+from .transcription.transcription_agent import TranscriptionAgent
+from .vad_agent import VADAgent
+
+__all__ = [
+    "BaseAgent",
+    "BeliefCollectorAgent",
+    "LLMAgent",
+    "RICommandAgent",
+    "RICommunicationAgent",
+    "TranscriptionAgent",
+    "VADAgent",
+]