The structure lint requires files sharing a name prefix to live in a
directory of that name. tasks/utils/install_plugin.yml and
tasks/utils/install_mu_plugin.yml violated that from the moment they
landed in 4d9bf6da3; move both into tasks/utils/install/ and repoint the
three includes.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>