Copilot instructing me to navigate terminal ui of another powershell executable

### Describe the bug

The agent told me to "use the arrow keys to navigate and press Enter to select a file". This is something that is impossible since I have no access to the spawned shell session. The agent should detect that it is asking me to interact with a terminal UI they cannot reach and avoid giving that guidance.

### Affected version

GitHub Copilot CLI 1.0.36

### Steps to reproduce the behavior

Requirements:

Install custom tools that copilot can actually use such as ripgrep, and tools that copilot cannot use (like fzf or ohmyposh)

Repro Steps:
1. Open Copilot CLI in a repo.
2. Ask to find YAML files mentioning X
3. The agent runs: rg -l -i "X" --glob "*.yml" | fzf in async mode.
4. The agent then tells me to "use arrow keys to navigate", but I have no access to the shell session and cannot do this.

### Expected behavior

The agent should detect when a spawned process is an interactive TUI and not prompt me to use arrow keys, navigate, or otherwise interact with a shell I cannot interact with

### Additional context

_No response_

按照列出的步骤在 Copilot CLI 1.0.36 中复现该问题，尤其是异步执行的 `rg -l -i "X" --glob "*.yml" | fzf` 命令。跟踪 agent 如何接收并呈现所启动进程的输出。当它不再指示用户导航到或交互操作无法访问的终端 UI 时，即表示完成。

由索引模型根据 Issue 内容生成。