Use the command helper in the AI app removers

test/shell.d/bin-style-test.sh has been failing on quattro: the OpenClaw
remover checks for gum with a raw `command -v`, which the style rule
reserves for the helpers themselves.

The Hermes remover does the same thing. It was invisible because the test
fails on the first offending file, so fixing OpenClaw alone just moves the
failure along.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013p9Qh6dX4FuwBJAWhNPVbn

bin/omarchy-remove-ai-hermes

@@ -73,7 +73,7 @@ fi
 # never owned, a yes takes that with it, and saying so is the prompt's job.
 # Without a terminal to ask in, keeping everything is the answer.
 data_removed=false
-if [[ -d $HOME/.hermes || -d $HOME/.config/Hermes ]] && [[ -t 0 ]] && command -v gum >/dev/null; then
+if [[ -d $HOME/.hermes || -d $HOME/.config/Hermes ]] && [[ -t 0 ]] && omarchy-cmd-present gum; then
   # du answers non-zero when either directory is missing, and pipefail would
   # turn that into an aborted removal; the size is worth no such thing.
   size=$(du -shc "$HOME/.hermes" "$HOME/.config/Hermes" 2>/dev/null | tail -1 | cut -f1 || true)

bin/omarchy-remove-ai-openclaw

@@ -61,7 +61,7 @@ gtk-update-icon-cache "$HOME/.local/share/icons/hicolor" &>/dev/null || true
 # front of the user with the size rather than left silent. Without a terminal
 # to ask in, keeping it is the answer.
 state_removed=false
-if [[ -d $HOME/.openclaw && -t 0 ]] && command -v gum >/dev/null; then
+if [[ -d $HOME/.openclaw && -t 0 ]] && omarchy-cmd-present gum; then
   size=$(du -sh "$HOME/.openclaw" 2>/dev/null | cut -f1)
   if gum confirm --default=false "Also delete ~/.openclaw ($size: chats, memories, credentials, and downloaded plugins)?"; then
     rm -rf "$HOME/.openclaw"