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/tasks/services.py

@@ -16,12 +16,11 @@ def _to_uuid(val: str | UUID | None) -> UUID | None:
         return val
     return uuid.UUID(str(val))
 
-from sqlalchemy import func, select
-from sqlalchemy.ext.asyncio import AsyncSession
-
-from app.core.visibility import apply_visibility_filter
-from app.plugins.builtins.tasks.models import Task
+from sqlalchemy import func, select  # noqa: E402 — after helper defs by design
+from sqlalchemy.ext.asyncio import AsyncSession  # noqa: E402
 
+from app.core.visibility import apply_visibility_filter  # noqa: E402
+from app.plugins.builtins.tasks.models import Task  # noqa: E402
 
 # Lifecycle statuses in display order (Kanban columns)
 STATUS_ORDER = ["open", "in_progress", "review", "blocked", "done", "cancelled"]
@@ -307,7 +306,6 @@ async def create_task(
         entity_id = contact_id
     # Don't store contact_id in FK column if it's just a polymorphic entity link
     # — contact_id FK requires a real Contact row. Use entity_id instead.
-    contact_id_for_fk = _to_uuid(contact_id) if contact_id else None
 
     # Resolve polymorphic creator.
     creator_type = data.get("creator_type", "user")