feat: integrated with sandbox

backend/src/agents/thread_state.py

@@ -0,0 +1,11 @@
+from typing import TypedDict
+
+from langchain.agents import AgentState
+
+
+class SandboxState(TypedDict):
+    sandbox_id: str | None = None
+
+
+class ThreadState(AgentState):
+    sandbox: SandboxState | None = None