feat(agent): migrate to native CrewAI tool loop and async resume enqueue

backend/src/v1/agent/router.py

@@ -13,7 +13,10 @@ from fastapi import HTTPException
 from fastapi.responses import StreamingResponse
 
 from core.agent.infrastructure.agui.stream import to_sse_event
-from core.agent.domain.agui_input import parse_run_input
+from core.agent.domain.agui_input import (
+    parse_run_input,
+    validate_run_request_messages_contract,
+)
 from core.auth.models import CurrentUser
 from services.base.redis import get_or_init_redis_client
 from v1.agent.dependencies import get_agent_service
@@ -76,7 +79,8 @@ async def enqueue_run(
     current_user: Annotated[CurrentUser, Depends(get_current_user)],
 ) -> TaskAcceptedResponse:
     try:
-        parse_run_input(request.model_dump(mode="json", by_alias=True))
+        normalized = parse_run_input(request.model_dump(mode="json", by_alias=True))
+        validate_run_request_messages_contract(normalized)
     except ValueError as exc:
         raise HTTPException(status_code=422, detail=str(exc)) from exc
     allowed = await _allow_run_request(user_id=str(current_user.id))
@@ -88,9 +92,9 @@ async def enqueue_run(
         current_user=current_user,
     )
     return TaskAcceptedResponse(
-        task_id=task.task_id,
-        thread_id=task.thread_id,
-        run_id=task.run_id,
+        taskId=task.task_id,
+        threadId=task.thread_id,
+        runId=task.run_id,
         created=task.created,
     )
 
@@ -118,9 +122,9 @@ async def enqueue_resume(
         current_user=current_user,
     )
     return TaskAcceptedResponse(
-        task_id=task.task_id,
-        thread_id=task.thread_id,
-        run_id=task.run_id,
+        taskId=task.task_id,
+        threadId=task.thread_id,
+        runId=task.run_id,
         created=task.created,
     )
 
@@ -134,12 +138,8 @@ async def stream_events(
     last_event_id: str | None = Header(default=None, alias="Last-Event-ID"),
     idle_limit: int = Query(default=300, ge=1, le=3600),
 ) -> StreamingResponse:
-    if (
-        last_event_id is not None
-        and (
-            len(last_event_id) > 32
-            or _LAST_EVENT_ID_RE.fullmatch(last_event_id) is None
-        )
+    if last_event_id is not None and (
+        len(last_event_id) > 32 or _LAST_EVENT_ID_RE.fullmatch(last_event_id) is None
     ):
         raise HTTPException(status_code=422, detail="Invalid Last-Event-ID")