Path A (rapp-*) is the target; Path B (create-overlay) is transitional;
Path C (railiance-apps S5) is how user-facing apps still ship. Fabric
is discovery only.
Record how rapp-* repos wrap first-party apps for Railiance, using
user-engine as the pilot. Opens RMGR-WP-0006 (T01 done) and includes
fix-consistency ID writeback for WP-0004/0005/0006.
