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09f0bab194
The 'runs checks in parallel' test raced three real setTimeout delays (10/20/30ms) and asserted their exact completion order. Timer scheduling jitter on Windows CI runners reordered the sub-50ms timers, so the suite flaked and failed every Windows test job. Replace the timing race with a start-barrier: each hook blocks until all hooks have started. This only completes if the checks run concurrently -- were they awaited one at a time, the first hook would wait forever for siblings that never start. No timers, no ordering assumptions.