Map Labels

Consider implementing labeling for the mapper (i.e., Fenton's `labelRoomName` that was never finished). Fenton was trying to make the mapper automatically label _General Store_, _Shop_, _Custom_, and _Food_ environments only.

Start by locating Fenton's unfinished `labelRoomName` implementation and reading the mapper's existing room-labeling flow. Done means the mapper automatically labels only General Store, Shop, Custom, and Food environments, with behavior verified against the relevant mapper functionality.

Written by the indexing model from the issue text.