Bathroom
A volume containing a bath or a shower as well as sanitary fittings; strip the bathing provision out and it becomes `wc`.
materialgraph ms_room + materialsinuse PROGRAM_SPACE_TYPES
`application.bath` in the published APPLICATIONS axis is a room sitting inside a surface-use vocabulary, and is superseded by this term. The edge here is `related-to` and not `suitable-for` on purpose: `suitable-for` runs from a material-suitability claim TO a space, so the correct `suitable-for` edge points the other way and belongs on the applications side, alongside the deprecation.