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Skip closing an already closed asyncio loop in __del__ (#1417)

AsyncioEventLoop.__del__ closed its own runner even when the loop was already closed.
In a reference cycle the loop's finalizer can run first, so Runner.close() raised
"Event loop is closed" as an unraisable exception (seen on free-threaded builds).

- __del__ closes the runner only while its loop is still open.
- __init__ keeps the runner only once its loop was created, so __del__ never reads a missing loop.

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