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The cancellation drain in run_until_complete steps the loop after run_forever has already cleared the running-loop slot, and from Python 3.14 a task refuses to step unless its loop is the running one — so the drain now declares itself for its duration. The plugin tests also pin child pytest stdio to UTF-8: a failure traceback can render source lines carrying an em-dash, which a Windows child writes in the console code page while pytester reads UTF-8 back.
Python 3.14's loop contract grows an eager_start parameter on create_task. An eager first step runs at creation time, before the ready queue ever sees the task, so the seeded draw would never get to order it against anything: accepting the argument and fencing a true value is the honest answer, and declining it stays the stdlib default.
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Adds windows-latest and CPython 3.14 to the test matrix, keeping fail-fast off so a platform-specific failure shows the full picture. The core is pure stdlib and the parallel explorer already uses the spawn start method, so Windows is expected to pass; this run is the proof rather than the claim.