Calamares isn't in Arch's official repos, so BOS vendors the PKGBUILD and
publishes a built package to the [breadway] repo. All its deps are official
(kpmcore, qt6-*, yaml-cpp). Also drop the nonexistent calamares-qt6 from the
package list (calamares 3.4.x is already Qt6).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
