CLI skips 'a' on all commands on both vscode and terminal

### Describe the bug

Every time on MacOS i try to run a Github CLI session it hits a bug where it cannot parse the 'a' character and skips in each command.

e.g. runs `git add file/abc123` -> `git dd file/abc123`

### Affected version

1.0.39

### Steps to reproduce the behavior

1. I open CLI on terminal or vscode chat
2. It responds and runs any bash command with an 'a'
3. The command gets incomplete because 'a' is getting skipped/stripped
4. command fails

### Expected behavior

It should be able to seamlessly type any command without the 'a' getting stripped?

### Additional context

- iTerm2
- Bash / zsh
- MacOS Sequoia 15.7.5
- CLI version 1.0.39

首先，在 macOS Sequoia 15.7.5 上使用版本 1.0.39，透過終端機和 VS Code 聊天整合，分別使用 Bash 和 zsh 重現 CLI 中的問題。比較包含字母「a」的命令與其執行後的形式，並追蹤處理命令輸入的 CLI 路徑。完成標準是：命令保留每個字元，並在兩種環境中都能正確執行。

由索引模型根據 Issue 內容生成。