bug: windows 平台 Agent 调用 git bash 无法处理部分命令，并且会被误认为 MingW 环境，而非原生 MSVC 环境

[MaxwellGengYF]

What version of Kimi Code is running?

0.34.0

Which open platform/subscription were you using?

Any platform

Which model were you using?

Any model

What platform is your computer?

Windows 11

What issue are you seeing?

在 Windows 平台使用 Git-Bash 有与 powershell 不兼容的问题，同时语法也不完全兼容原生 POSIX Bash，导致模型经常出错试错，严重时会导致整个工作链条偏移：如开发时直接默认 MingW 环境编译，导致试图修复根本不存在的编译报错。

What steps can reproduce the bug?

任何 Agent loop 涉及到高频 Bash 调用

What is the expected behavior?

#2717
提交了一个 PR 单独解决这个问题。

Additional information

No response