fix(installer): carapace not in pacman repos on Arch

[AdrianLinares]

Problem

The Arch (pacman) shell-install step in the TUI installer fails with target not found: carapace, aborting the whole shell-install step on a fresh Arch Linux box before starship.toml or the fish config are copied.

Root cause

The installer declares carapace as a pacman package in the Arch field of the Fish, Zsh and Nushell steps (installer/internal/tui/installer.go):

Arch:   "fish carapace zoxide atuin starship",

But carapace is not in the official Arch repositories. It only exists in the AUR as carapace (source build) or carapace-bin (prebuilt; Provides: carapace). pacman -S --needed --noconfirm fish carapace zoxide atuin starship therefore errors out on carapace and the entire shell step is marked failed.

This is unrelated to the Brew/Fedora/Debian fields — carapace IS installable via Homebrew and is in the Fedora repos, so those paths work fine; only the pacman path is broken.

Fix

Remove carapace from the three Arch fields only (Fish, Zsh, Nushell). The Brew/Fedora/Debian fields are left untouched — carapace remains installable there.

File	Change
installer/internal/tui/installer.go	Drop carapace from the Arch: field of the Fish, Zsh and Nushell installPlatformPackages calls

Arch users who actually want carapace can install it from the AUR (carapace-bin) or via the Homebrew fallback path.

Verification

$ cd installer && go build ./...      # ok
$ cd installer && go vet ./internal/tui/   # ok
$ cd installer && go test ./...
ok      github.com/Gentleman-Programming/Gentleman.Dots/installer/internal/tui/trainer
FAIL    github.com/Gentleman-Programming/Gentleman.Dots/installer/internal/tui

The single failing test (internal/tui) is an environmental golden-file mismatch — the golden expects Detected: macOS but this machine runs Arch Linux. It fails identically on pristine main (without this patch) and is unrelated to the change in this PR.

[rafafrdz]

same problem here (CachyOS)

[chicoj2ck]

I have the same problem (CachyOs)