omarchy-settings-dev provides omarchy-settings (unversioned), so an
unversioned dependency let the dev package satisfy stable omarchy's
settings requirement, allowing a mixed dev/stable install. A versioned
dependency (omarchy-settings=${pkgver}) can only be satisfied by the
real settings package from the same pinned commit and forces the pair
to upgrade together. Verified: requesting only omarchy on a system with
the -dev pair installed replaces both with the stable pair.