[BUG] `/terminal-setup` should ask for permission, not forgiveness

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?

It was suggested that I run /terminal-setup, so I did. Without telling what it did, claude created .wezterm.lua. This shadowed .config/wezterm/wezterm.lua thereby reverting my customizations. It took a while to figure out what had happened.

What Should Happen?

Claude already knows how to show me diffs and ask if they're OK, it should do that in this case so I can say "no" instead of having to go revert the file myself.

Error Messages/Logs

Steps to Reproduce

1. Run /terminal-setup
2. Be suprised about what was changed

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.1

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_