Use the command helper in the AI app removers

[codemonkey76]

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

$ ./test/all
bin/omarchy-remove-ai-openclaw
not ok - bin commands use command helpers

The Hermes remover does the same thing. That one is invisible until the first is fixed, because the test reports only the first offending file — so fixing OpenClaw alone just moves the failure along to the next.

Both now use omarchy-cmd-present, matching the rest of bin/.

Test plan

• ./test/all — 226/226 files pass. Before this change, bin-style-test.sh failed and the suite reported 1 of 226 failing.
• rg -l 'command -v' bin/ | rg -v '/omarchy-(cmd-|pkg-|upgrade-to-quattro)' returns nothing.

🤖 Generated with Claude Code

https://claude.ai/code/session_013p9Qh6dX4FuwBJAWhNPVbn

[smfworks]

Code Review Summary

Verdict: Approved

Replacing raw command -v gum with omarchy-cmd-present gum in both AI removers matches the bin-style rule and unblocks ./test/all on quattro. Hermes and OpenClaw keep the same keep-data-by-default prompt.

Note: #10443 also touches bin/omarchy-remove-ai-hermes (it drops the gum presence check entirely). Merge this first so OpenClaw is fixed; rebase #10443 so the Hermes remover does not reintroduce command -v.