jif 21b1ef18c6
Retain thread persistence acquisition through session cancellation ( #45487 ) ...
## Why
Session initialization can be cancelled after a persistence writer is installed but before acquisition returns. Cleanup must wait for acquisition to finish so it can discard the writer.
## What changed
Extend `LiveThreadInitGuard` to own in-flight acquisition and finish it before discarding persistence, including when the guard is dropped. Use the guard for thread creation, resume, and inherited model context initialization.
## Testing
Add a regression test that cancels acquisition after writer installation, verifies cleanup waits for handoff, and confirms the writer is removed afterward.
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21b1ef18c6