feat: implement AgentManager for agent lifecycle control

src/agents/lifecycle/AgentManager.py

@@ -0,0 +1,17 @@
+class AgentManager:
+    """
+    Manages the lifecycle of autonomous agents within DreamServer.
+    Handles startup, heartbeat monitoring, and graceful shutdown.
+    """
+    def __init__(self):
+        self.active_agents = {}
+
+    def spawn_agent(self, agent_id, config):
+        print(f"Spawning agent {agent_id} with config: {config}")
+        # Logic to initialize agent process/container
+        self.active_agents[agent_id] = {"status": "starting", "config": config}
+
+    def stop_agent(self, agent_id):
+        if agent_id in self.active_agents:
+            print(f"Stopping agent {agent_id}...")
+            self.active_agents[agent_id]["status"] = "stopped"