runNotebookCell a cell that generates audio takes up a lot of context

- Copilot Chat Extension Version: 0.58.0
- VS Code Version: 1.130.0
- OS Version: Windows_NT x64 10.0.19045
- Feature (e.g. agent/edit/ask mode): agent
- Selected model (e.g. GPT 4.1, Claude 3.7 Sonnet): DeepSeek V4 Flash
- Logs:

Steps to Reproduce:

1. add any folder to chat
2. use prompt `在这个文件夹里创建一个新的笔记本，产生一个一秒长的220hz的纯音，使用display(Audio(xx))来让音频可播放，我需要你运行笔记本单元格`
3. before running the audio cell, context is 29k, after is 112.8k