[arthware-dev]

Summary

• Element X encrypts every room it creates and cannot switch that off, so a family on a new phone without the recovery key loses the history of rooms the bots work in. An admin can now write stack room create <name> in the Server Room: Stacker creates the room unencrypted in the Family space, invites the family and the archivist, makes the family's admins its admins, and replies with a link. A name starting with Topic: or Thema: becomes a topic room as before. A name or address already in use gets a link to that room and no second room. Non-admins are refused like for the other changing commands.
• The work is done by stack messages room create, which now also takes just a name (stack messages room create "Topic: Garden"), derives the alias from it, sets the room's space parent and invites the family. The core API gains a room-create command that runs it for Stacker, with the name as one argument. A taken alias no longer exits with an error; the command names the existing room.
• The user guide's "The rooms" and the messages admin guide name the command.

Defaults to confirm

1. Who is invited. Every family member with a chat account (admins, and members with messages in their stacklets) plus the archivist. People get an invite to accept; stack messages setup force-joins its own rooms instead. Recommendation: keep invites, so nobody gets a room they did not ask for.
2. Stacky is not invited. The agent joins only when someone invites it, as in every other room. Recommendation: keep it out by default; inviting it is one tap in the room.