Add WezTerm terminal installer with Windows/Linux version choice

[Copilot]

Adds installer for WezTerm terminal emulator with option to install either the Windows native version (better window management) or the Linux version (requires X/WSLg).

Changes

• pengwin-setup.d/wezterm.sh - Main installer with version selection menu
  • Windows: Downloads installer from GitHub releases
  • Linux: Installs via official APT repository (apt.fury.io/wez)
• pengwin-setup.d/uninstall/wezterm.sh - Removes Linux package, APT repo, and GPG key
• pengwin-setup.d/terminal.sh - Added WEZTERM to Terminal menu
• pengwin-setup.d/uninstall.sh - Added WEZTERM to uninstall menu
• completions/pengwin-setup - Added completions for WEZTERM and WEZT_WINDOWS/WEZT_LINUX sub-options
• tests/wezterm.sh - Unit tests for install/uninstall

Usage

# Interactive
pengwin-setup  # GUI > Terminal > WezTerm

# Non-interactive
pengwin-setup install GUI TERMINAL WEZTERM WEZT_LINUX
pengwin-setup install GUI TERMINAL WEZTERM WEZT_WINDOWS
pengwin-setup install UNINSTALL WEZTERM

Original prompt

create an installer for wezterm: https://wezterm.org/ but in this time you'll also ask if the user want the Windows or the Linux version. i am not clear if there is any advantages of any despite the better window management in the case of Windows

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