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Eric Traut 27bf160f79 Retry TUI reconnects while threads are closing (#42207)
## Why

An app-server thread can still be closing when the TUI reconnects. Its
`thread/resume` request then uses the same `-32600` error code as an unavailable
thread, even though the thread can be resumed once closing finishes.

## What changed

Treat the thread-specific "is closing" response as a transient reconnect error
so the existing reconnect loop retries instead of marking the conversation
unavailable.

## Testing

Extend the active reconnect and end-to-end reconnect tests to cover a closing
thread that resumes successfully on the next attempt.

GitOrigin-RevId: 30ce232b8894065fef346a86128b3ff9bf36ba1f
2026-09-02 05:10:55 +00:00
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