ci: fix lint baseline and stabilize failing main tests

src/core/kill_switch.py

@@ -11,8 +11,9 @@ Order is fixed:
 from __future__ import annotations
 
 import inspect
+from collections.abc import Awaitable, Callable
 from dataclasses import dataclass, field
-from typing import Any, Awaitable, Callable
+from typing import Any
 
 StepCallable = Callable[[], Any | Awaitable[Any]]