scripts: add cleanup-i3 and cleanup-sway uninstallers

Two POSIX sh scripts to undo a session install on a Void host: remove
session-exclusive packages (filtered to those actually installed),
exclusive dotfiles and runtime state, plus the emptty session entry.
Shared resources (dunst, rofi, alacritty, xfce4-screenshooter) are left
in place so the other session keeps working. Confirmation prompt before
any destructive action.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

scripts/cleanup-i3.sh

@@ -0,0 +1,103 @@
+#!/usr/bin/env sh
+# Remove i3 session artifacts: exclusive packages, dotfiles and the emptty
+# xsessions entry. Shared resources with sway (dunst, rofi, alacritty,
+# xfce4-screenshooter) are left untouched.
+
+set -eu
+
+I3_PACKAGES="
+arandr
+autorandr
+feh
+i3
+i3blocks
+i3blocks-blocklets
+i3lock-color
+i3status
+picom
+polybar
+scrot
+setxkbmap
+volumeicon
+xclip
+xfce4-clipman-plugin
+xkbutils
+xorg-fonts
+xorg-minimal
+xss-lock
+xdotool
+"
+
+I3_DOTFILES="
+$HOME/.config/i3
+$HOME/.config/i3blocks
+$HOME/.config/picom
+$HOME/.config/polybar
+$HOME/.xinitrc
+"
+
+EMPTTY_SESSION=/etc/emptty/xsessions/i3.desktop
+
+confirm() {
+  printf '%s [y/N] ' "$1"
+  read -r answer
+  case "$answer" in
+    y|Y|yes|YES) return 0 ;;
+    *) return 1 ;;
+  esac
+}
+
+filter_installed() {
+  for p in $1; do
+    if xbps-query -p pkgver "$p" >/dev/null 2>&1; then
+      printf '%s\n' "$p"
+    fi
+  done
+}
+
+if ! command -v xbps-remove >/dev/null 2>&1; then
+  printf 'Error: xbps-remove not found (not a Void host?)\n' >&2
+  exit 1
+fi
+
+installed=$(filter_installed "$I3_PACKAGES" | tr '\n' ' ' | sed 's/ *$//')
+
+printf '== i3 cleanup ==\n\n'
+printf 'Packages to remove (installed only):\n'
+if [ -n "$installed" ]; then
+  printf '  %s\n' $installed
+else
+  printf '  (none)\n'
+fi
+printf '\nDotfiles to remove:\n'
+for d in $I3_DOTFILES; do
+  if [ -e "$d" ] || [ -L "$d" ]; then
+    printf '  %s\n' "$d"
+  fi
+done
+printf '\nEmptty session entry:\n'
+if [ -e "$EMPTTY_SESSION" ]; then
+  printf '  %s\n' "$EMPTTY_SESSION"
+else
+  printf '  (absent)\n'
+fi
+printf '\nShared (NOT removed): dunst, rofi, alacritty, xfce4-screenshooter and their configs.\n\n'
+
+confirm 'Proceed?' || { printf 'Aborted.\n'; exit 0; }
+
+if [ -n "$installed" ]; then
+  # shellcheck disable=SC2086
+  sudo xbps-remove -Ry $installed
+fi
+
+for d in $I3_DOTFILES; do
+  if [ -e "$d" ] || [ -L "$d" ]; then
+    rm -rf -- "$d"
+  fi
+done
+
+if [ -e "$EMPTTY_SESSION" ]; then
+  sudo rm -f -- "$EMPTTY_SESSION"
+fi
+
+printf '\nDone.\n'