## Why
`thread_resume` tests can intentionally create an in-flight turn, assert
a `thread/resume` error path, and return immediately. That leaves turn
work active during teardown, which can surface as intermittent `LEAK`
failures.
Sample output that motivated this investigation (reported during test
runs):
```text
LEAK ... codex-app-server::all suite::v2::thread_resume::thread_resume_rejoins_running_thread_even_with_override_mismatch
```
## What Changed
Updated only `codex-rs/app-server/tests/suite/v2/thread_resume.rs`:
- `thread_resume_rejects_history_when_thread_is_running`
- `thread_resume_rejects_mismatched_path_when_thread_is_running`
Both tests now:
1. capture the running turn id from `TurnStartResponse`
2. assert the expected `thread/resume` error
3. call `turn/interrupt` for that running turn
4. wait for `codex/event/turn_aborted` before returning
## Why This Is The Correct Fix
These tests are specifically validating resume behavior while a turn is
active. They should also own cleanup of that active turn before exiting.
Explicitly interrupting and waiting for the terminal abort notification
removes teardown races and avoids relying on process-drop behavior to
clean up in-flight work.
## Repro / Verification
Repro command used for investigation:
```bash
cargo nextest run -p codex-app-server -j 2 --no-fail-fast --stress-count 50 --status-level leak --final-status-level fail -E 'test(suite::v2::thread_resume::thread_resume_rejoins_running_thread_even_with_override_mismatch) | test(suite::v2::thread_resume::thread_resume_rejects_history_when_thread_is_running) | test(suite::v2::thread_resume::thread_resume_rejects_mismatched_path_when_thread_is_running) | test(suite::v2::thread_resume::thread_resume_keeps_in_flight_turn_streaming)'
```
Observed before this change: intermittent `LEAK` in
`thread_resume_rejects_history_when_thread_is_running`.
Also verified with:
- `cargo test -p codex-app-server`
---
[//]: # (BEGIN SAPLING FOOTER)
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* #12271
* __->__ #12269
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