E.17.1:17.3 - Migration from publication-face/form-bound naming

If a legacy practice uses one label interchangeably for a viewpoint family, a viewpoint, a report section, and a publication face, migration separates those positions explicitly. The ordinary family designator remains at the declaration layer; exact U.ViewpointRef values resolve P while any reader-facing viewpoint token is only P’s designator; publication-face names remain publication-layer vocabulary.