Revert "fix: unit test refactoring with conftest and more mocks"

This reverts commit 423309e063.

src/control_backend/agents/ri_communication_agent.py

@@ -7,6 +7,7 @@ import zmq
 
 from control_backend.core.config import settings
 from control_backend.core.zmq_context import context
+from control_backend.schemas.message import Message
 from control_backend.agents.ri_command_agent import RICommandAgent
 
 logger = logging.getLogger(__name__)