Starting set of BuildingType instances.
These constants represent the initial catalogue of building types available when a new world is created. They serve two purposes:
- Seed the starting world (placed during world initialisation).
- Pre-populate the vector DB (feature 16) so the world can do semantic
look-ups, e.g. a player asking to build a "shelter" can be matched to
HOUSE.
New types discovered or invented by players during a run will be added to the vector DB dynamically and are not listed here.