ViewAudienceChanged
History only: never produced, only evolved. The 9.x view's move to another audience (its ViewAudienceChanged, a 9.x owner transfer), kept so the 9.x history migrate-data imports still loads: a view moves to audience as ViewShared or ViewClaimed moves it. No command produces it (the view store's tests check it); a view shared or claimed in 10.x records ViewShared or ViewClaimed. toOwnerId is the owner 9.x moved the view to, which the import records as the stream's owner (its map's owner field).