[BUG] Ctrl-Z needlessly trapped.

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?

When I try to use Ctrl-Z to put Claude in the background, I get this superfluous message, ctrlz gets trapped, and I have to type it a second time for it to kick in. This has zero value to anybody. We all know how ctrl-z works. Please revert this change.

Claude Code has been suspended. Run `fg` to bring Claude Code back.
Note: ctrl + z now suspends Claude Code, ctrl + _ undoes input.
^Z

What Should Happen?

Claude should respect how Unix has worked for over 60 years now. There is no value or reason whatsoever to trap CtrlZ and put an interim, function-less intermediary.

Error Messages/Logs

Steps to Reproduce

Type Ctrl Z

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.0.75

Claude Code Version

2.0.76

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Just because you CAN do something does not mean that you SHOULD do something.