Albert MeltzerandClaude Opus 5 952b82e461 [2.x] fix: Share a holder for a closeable (#9692)
**Problem**
Four fields hold a closeable that a later caller replaces. Each one
reads the field, closes what it finds and writes the new value in its
own way.

**Solution**
AtomicCloseable holds such a value. It closes the value it replaces,
and closes the value that loses a race to fill an empty field.

Two things change for a caller. The client replaced its session
without closing the one it dropped, and now closes it. A close that
throws no longer escapes: each of these sites is discarding the value
it closes, and whatever led there matters more than the close.

Co-authored-by: Claude Opus 5 (1M context) <[email protected]>
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