fix(e7): CI-Gate-Vorbereitung — ruff über app/ von 105 auf 0 Findings bereinigt; 8 echte F821-NameError-Produktionsbugs behoben (external_api stream_chat-Call-Signatur an stream_chat_comm angepasst, agent_runner uuid vor lokalem Import, automation/plugin UserTenant-Import, tasks delete-audit user_id, workflows/engine timedelta, unified_search/contracts Any); py311-kompatibles StepHandler-Alias statt type-Statement; E402/F841 bereinigt; Verifikation 85/89 grün (4 Failures = bekannter Vorbestand BUG-099)

app/plugins/builtins/knowledge/services.py

@@ -1,10 +1,13 @@
 """Knowledge extraction services — LLM-based entity/relationship extraction."""
 from __future__ import annotations
+
 import logging
 import uuid
 from typing import Any
-from sqlalchemy import select, update
+
+from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
+
 from app.ai.llm_client import llm_complete
 from app.plugins.builtins.knowledge.models import KnowledgeExtraction