Deprecated: `map.prompt.room` ???

Should we go through and replace `map.prompt.room` with `gmcp.room.info.name` everywhere or define it once and for all at the beginning? It's not a local variable so the user can alter it as intended, but would there ever be a reason to do so? discMapper sets the room name based on what the game sends rather than misidentified text or location as previously.

Search the discMapper codebase for map.prompt.room and gmcp.room.info.name, then read the code that sets the room name from game data. Determine whether the prompt value must remain user-editable or can be replaced, and document or implement one consistent choice throughout the mapper.

Written by the indexing model from the issue text.