GH integration test: task_progress

Testing codexapi gh-task integration.

## Progress

`[01/10 0h00m29s]` ✅ Agent incremented to 1 and stopped; verifier confirms /tmp/codexapi_work_done.txt is 1 as required.

```
 33%|███████████████                              | 1/3 [00:29<00:59, 29.65s/it]
```
