77ca10aa37
The writer concurrency fake parks on its release signal (the 300 ms delay could release the gate early on a starved pool), the supervisor test's cross-thread hold flag is Volatile, and the EffectiveTimeout doc now states the 1 s floor the code and tests implement. Refs #735 Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT