[Herklos]

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Summary

Always wait for thread pool shutdown now that Python 3.13 is required.

Changelog

• Drop the Python < 3.9 private-thread clear in stop_thread_pool_executor_non_gracefully.
• Close websocket connector pools with shutdown(wait=True) only.
• Replace the uncollected sleep-forever helper test with one pytest collects.

What's new?

stop_thread_pool_executor_non_gracefully still had a branch that cleared private ThreadPoolExecutor thread tables. That branch ran only before Python 3.9. On 3.13 it never ran: both the helper and websocket close_sockets already called shutdown(wait=True).

The helper keeps its name. The docstring now says it waits. Websocket close no longer checks sys.version_info.

packages/commons/tests/thread_util.py was not collected by pytest. It submitted workers that sleep forever and then called the helper, which would hang on 3.13. It is now tests/test_thread_util.py and checks that a short task finishes and a later submit raises RuntimeError.

packages/commons pytest: tests/test_thread_util.py passed (1 test). Extended linter against origin/dev: 0 violations.