/terminal-setup fails on Windows Terminal despite being listed as supported

Description

Running /terminal-setup in Claude Code on Windows Terminal shows a contradictory error message:

Terminal setup cannot be run from windows-terminal.

This command configures a convenient Shift+Enter shortcut for multi-line prompts.
...
To set up the shortcut (optional):
...
• Windows: Windows Terminal <-- listed as supported

The error says it "cannot be run from windows-terminal" but then lists "Windows Terminal" as a supported terminal.

Expected behavior

Either:

1. The automatic setup should work for Windows Terminal, or
2. The error message should clarify that Windows Terminal requires manual setup and not list it as a supported terminal for automatic configuration

Workaround

Manual setup works fine by adding this to Windows Terminal's settings.json:

```json
{
"command": {
"action": "sendInput",
"input": "\u000A"
},
"keys": "shift+enter"
}

Environment

• OS: Windows 10, German locale
• Terminal: Windows Terminal