Add per-session cap for queued reactor commands #590
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Enforce limit in IOSessionImpl and cover with a regression test
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This change adds an optional cap on the number of queued commands per I/O session. When configured, IOSessionImpl rejects additional enqueues once the per-session queue reaches the limit and releases capacity as commands are polled. The default remains unchanged (unlimited) when the option is not set. A small regression test covers rejection and subsequent acceptance once the queue is drained.