Live matching only recognized srv.ID+"."+name == registry canonical, so
the 101 canonicals whose reviewed interface_ref routes to a differently
named server/tool were silently skipped and stayed frozen at the
previous snapshot (or degraded to stubs). Build a reverse index from the
previous snapshot's reviewed interface_refs (live key → canonicals) and
fan the live descriptor out to every owning canonical, preserving the
reviewed ref through the existing merge semantics.