[BUG] [macOS] Korean Input Method (IME) compatibility issue - Characters not appearing in Claude Code CLI

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?

Korean characters from custom input method (galmadiuli keyboard) are not
appearing in Claude Code CLI. When I type q, w, e, r keys, they should produce
Korean characters 〈, 〉, 「, 」 but only show as original English letters.
This works perfectly in Gemini CLI and other applications, but fails in Claude Code CLI.

What Should Happen?

Korean input method characters should appear correctly in Claude Code CLI,
just like they do in Gemini CLI. When I type q→〈, w→〉, e→「, r→」, these
Korean characters should display properly in the terminal.

Error Messages/Logs

Steps to Reproduce

1. Install Korean input method with galmadiuli keyboard layout
2. Open Claude Code CLI
3. Try typing q, w, e, r keys
4. Observe that only English letters appear (q, w, e, r)
5. Compare with Gemini CLI where Korean characters (〈, 〉, 「, 」) appear

correctly

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.0.117 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

<img width="679" height="218" alt="Image" src="https://github.com/user-attachments/assets/067739f0-8fd5-46bd-8298-3d66ae5fa3bd" />