[BUG] Interactive REPL exits immediately on WSL (non-interactive mode works fine)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Claude Code v2.1.37, Ubuntu 24.04 on WSL2 (Windows 10/11)
claude -p "hello" works perfectly
Interactive claude opens, shows welcome screen, then exits after ~4 seconds with exit code 0
No errors in debug log — process just silently terminates
Tried: unbuffer claude, TERM=xterm claude, clean .bashrc, different directories, fresh install on Ubuntu 24.04 (also reproduced on 18.04)
Auth is fine (Opus 4.6 · Claude Max)
Proxy: HTTPS_PROXY set (connection verified via curl)

What Should Happen?

no auto-close after 4 seconds.

Error Messages/Logs

Steps to Reproduce

it can work after i git clone by SSH dome documents and try to use claude in this folder with VS code.
so

1. install claude with WSL
2. setup proxy
3. with ssh clone some folder form gitlab
4. go to that folder
5. code . (opens vs code)
6. claude

FR: exits after 4 seconds without logs

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.37 (Claude Code)

Platform

Other

Operating System

Windows

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_