Compaction agent shouldn't be able to call ask_user, or any tools aside from reading files

### Describe the bug

While working with Copilot CLI, after a compaction started, I saw it tell me that the compaction is completed and if I want it to continue the implementation, answering yes seemed to just cause it to get stuck for long- I'm assuming the compaction agent continued working on the task but since the tool calls from it aren't visible, it seems like it's doing nothing. In another case when this happened, I answered it to finish the compaction to not continue working and that it's only the compaction agent and only then it actually successfully finished the compaction

### Affected version

1.0.9

### Steps to reproduce the behavior

Seems to happen randomly, specifically happens to me with GPT 5.4 for some reason

### Expected behavior

For the compaction agent to never continue working on the tasks itself, to not call tools like ask_user and to simply make the converastion summary

### Additional context

_No response_