Added set_daemon(True|False) to opt in to daemon threads/processes for @task workers (default False preserves the historical non-daemon contract so existing callers continue to have the interpreter wait for in-flight tasks on exit). Long-lived fire-and-forget workers (schedulers, pollers, infinite cleanup loops) can now call multitasking.set_daemon(True) once — alongside set_engine() — to avoid blocking interpreter shutdown.
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