Joseph Doherty 09666cc719 fix(sessions): account SessionClosed for sweep-driven closes
TryBeginCloseIfExpired set _closeStarted when it reserved a session, so the
sweep's own CloseAsync reported AlreadyClosed: true and CloseSessionCoreAsync
skipped SessionClosed: lease-expired, faulted-reaped and detach-grace-expired
closes never left the sessions.open gauge and under-counted sessions.closed.
The reservation now writes Closing only; the first CloseAsync to take the
close lock does the accounting exactly once.
2026-10-22 06:19:20 -04:00
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