Tests did monkeypatch.setattr(<facade module>, name) where name is now defined in a
sibling module and the production path reads the sibling's binding. Where production
reads through BOTH bindings the setattr is duplicated onto the defining module (import
added next to the existing alias import); where only the sibling reads it the target is
repointed. Seams whose production readers go through the facade are left alone.
The HERMES_UPDATE_REEXEC child and the current-checkout Node repair
path printed success without calling _rebuild_desktop_after_update.
A failed rebuild now withholds the success banner the same way the
commits-pulled path does.
Fixes#97343
Teknium