fix(agent): serialize crewai flow stages and remove nested asyncio.run

backend/src/v1/agent/crewai_flow.py

@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+from typing import Any
+
+from pydantic import BaseModel
+
+
+class FlowState(BaseModel):
+    stage_trace: list[str] = []
+    current_stage: str | None = None
+    message: str = ""
+    context: dict[str, Any] = {}
+
+
+class AgentFlow:
+    def __init__(self) -> None:
+        self.state = FlowState()
+
+    async def run(self) -> dict[str, Any]:
+        result = await self.intent_recognition()
+        result = await self.task_execution(result)
+        result = await self.result_reporting(result)
+        return result
+
+    async def intent_recognition(self) -> dict[str, Any]:
+        self.state.current_stage = "intent"
+        self.state.stage_trace.append("intent")
+        return {"stage": "intent", "result": "intent recognized"}
+
+    async def task_execution(self, prev_result: dict[str, Any]) -> dict[str, Any]:
+        self.state.current_stage = "execution"
+        self.state.stage_trace.append("execution")
+        return {"stage": "execution", "result": "task executed"}
+
+    async def result_reporting(self, prev_result: dict[str, Any]) -> dict[str, Any]:
+        self.state.current_stage = "reporting"
+        self.state.stage_trace.append("reporting")
+        return {"stage": "reporting", "result": "reported"}