♻️ Reuse gis-user's read model as its write model
♻️ Reuse gis-user's read model as its write model

Why:
- Needs less code
- Unifies with the territory et al. namespaces
- Avoids the need to look up the gis-user inside the command handlers
  when the gis-user instead of the state is a parameter

orfjackal/territory-bro,orfjackal/territory-bro,orfjackal/territory-bro