terminal-setup command should support standard Linux terminals (gnome-terminal, xterm, etc.)

Problem

The /terminal-setup command fails to work in standard Linux terminal emulators, only supporting a small subset of modern IDE-integrated terminals and a couple of newer standalone terminals.

When running /terminal-setup in gnome-terminal, the command refuses to run with:

Terminal setup cannot be run from gnome-terminal.

Affected Terminals

This limitation excludes ubiquitous Linux terminals including:

• gnome-terminal (one of the most common Linux terminals)
• xterm
• konsole
• xfce4-terminal
• GNOME Console
• Most standard terminal emulators on Linux

The command only works in:

• VSCode, Cursor, Windsurf (IDE terminals)
• Ghostty, WezTerm (newer terminals)

Why This Matters

Linux users working in standard terminal environments are excluded from this feature. This particularly affects:

• Server administrators
• Developers using traditional terminal setups
• Users running tmux/screen in standard terminals
• Anyone using the default terminal on major Linux distributions

Expected Behavior

The terminal-setup command should either:

1. Support standard terminals via ANSI escape sequences/terminfo
2. Provide manual setup instructions for unsupported terminals
3. Clearly document this limitation upfront in the documentation
4. Be removed if broad terminal support cannot be achieved

Environment

• Terminal: gnome-terminal
• Platform: Linux (Fedora 41)
• Claude Code: latest version

Impact

A CLI tool designed for developers should work in standard developer terminals. This limitation excludes a significant portion of the Linux user base from accessing what appears to be a core feature.