fix: move VAD agent creation to RI communication agent

Previously, it was started in main, but it should use values negotiated by the RI communication agent.

ref: N25B-356

src/control_backend/agents/communication/ri_communication_agent.py

@@ -9,6 +9,7 @@ from control_backend.agents import BaseAgent
 from control_backend.core.config import settings
 
 from ..actuation.robot_speech_agent import RobotSpeechAgent
+from ..perception import VADAgent
 
 
 class RICommunicationAgent(BaseAgent):
@@ -185,6 +186,9 @@ class RICommunicationAgent(BaseAgent):
                         bind=bind,
                     )
                     await ri_commands_agent.start()
+                case "audio":
+                    vad_agent = VADAgent(audio_in_address=addr, audio_in_bind=bind)
+                    await vad_agent.start()
                 case _:
                     self.logger.warning("Unhandled negotiation id: %s", id)