Two install blockers found on the phone:
- the package shipped org.freedesktop.secrets.service, which gnome-keyring
owns. souveraine-secrets holds the bus name at runtime already.
- upower reused souveraine's 0.1.rN version, which sorts below the
hand-built 1.91.3+sha, so -Syu saw a downgrade and skipped it. Now
built from upstream version + fork sha (verified vercmp = 1).