fix: resolve CI failures introduced by PR #2 quality gates

backend/agent/vecna_litellm.py

@@ -77,7 +77,7 @@ async def _vecna_acompletion(*args: Any, **kwargs: Any):
 
 litellm_main.completion = _vecna_completion
 litellm_main.acompletion = _vecna_acompletion
-import litellm as _litellm_pkg
+import litellm as _litellm_pkg  # noqa: E402  (intentional: must follow litellm_main patching)
 
 _litellm_pkg.completion = _vecna_completion
 _litellm_pkg.acompletion = _vecna_acompletion

backend/app/main.py

@@ -6,12 +6,11 @@
 import time
 import uuid
 from contextlib import asynccontextmanager
-from fastapi import Depends, FastAPI, HTTPException, Request, WebSocket, WebSocketDisconnect
+from fastapi import Depends, FastAPI, HTTPException, WebSocket, WebSocketDisconnect
 from fastapi.responses import PlainTextResponse
 from fastapi.middleware.cors import CORSMiddleware
 from pydantic import BaseModel, Field
 from sqlalchemy import func, select
-from sqlalchemy.ext.asyncio import async_sessionmaker
 
 from app.config import Settings  # loads agent.vecna_litellm (patches litellm for OpenRouter)
 

backend/tests/test_errors.py

@@ -2,7 +2,6 @@
 
 Tests error classification and retry delay behavior for the agent runner.
 """
-import math
 import pytest
 
 from app.services.errors import (

backend/tests/test_http_client.py

@@ -2,7 +2,7 @@
 
 import json
 import time
-from unittest.mock import MagicMock, patch
+from unittest.mock import patch
 
 import httpx
 import pytest