Fix: bound socket thread pool#2604

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NewAlexandria wants to merge 2 commits intomanaflow-ai:mainfrom

NewAlexandria:fix/bound-socket-thread-pool

Commits on Apr 4, 2026

fix: bound socket client handler concurrency to prevent OOM on main thread stall
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docs(socket): clarify client queue vs semaphore cap; extract handler slot wait
NewAlexandria
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