feat: made program reset LLM

also added test_bdi_program_manager back cause
it was somehow missing in my files

ref: N25B-355

src/control_backend/agents/llm/llm_agent.py

@@ -52,6 +52,10 @@ class LLMAgent(BaseAgent):
                 await self._process_bdi_message(prompt_message)
             except ValidationError:
                 self.logger.debug("Prompt message from BDI core is invalid.")
+        elif msg.sender == settings.agent_settings.bdi_program_manager_name:
+            if msg.body == "clear_history":
+                self.logger.debug("Clearing conversation history.")
+                self.history.clear()
         else:
             self.logger.debug("Message ignored (not from BDI core.")