Await async cancellation cleanup

[Suke0811]

Summary

• add awaited async shutdown path that cancels tasks and closes owned loops safely
• ensure async spin context manager awaits task cancellation during exit
• add coverage for awaited cancellation and context cleanup

Testing

• PYTHONPATH=. pytest tests/test_ratecontrol.py::test_stop_spinning_async_task_cancel tests/test_ratecontrol.py::test_async_context_manager_waits_for_cleanup

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Stop async spins on wrong loop

stop_spinning now runs stop_spinning_async() via asyncio.run when no loop is running (lines 496-499), but stop_spinning_async awaits self._task, which remains bound to the loop that created it. When the spin is running on an owned/background loop, calling stop_spinning() from sync code now raises RuntimeError: ... attached to a different loop and leaves the task running. The cleanup coroutine needs to be scheduled on the task’s loop (e.g., via self._own_loop/run_coroutine_threadsafe) instead of a fresh loop.

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