The per-provider subagent limiter (providers.ollama-cloud.maxConcurrency)
created a fresh Semaphore whenever the configured limit changed, orphaning
in-flight slots on the old instance so a runtime or mixed limit value could
exceed the cap. getProviderSemaphore now always hands out one shared limiter
(Infinity when unlimited, so every run is still counted) and resizes it in
place. Semaphore.release() decrements before admitting, and the new
Semaphore.resize() raises the ceiling by admitting queued waiters while
lowering it drains in-flight holders without admitting past the new cap.
Refs #3464
can1357
ecd6f608e5