The swarm mints each agent's `main` account now, so the hive's own mint
goes: `ensure_user_for`, `finish_user_provisioning`, `sync_agent`,
`sync_agent_standalone`, `token_path`, `legacy_password_path`,
`auto_reset_password` and `token_file_present`, and the calls from the startup sweep and the
rebuild bookkeeping. Both mints pinned the device `hyperhive-<agent>`, so
leaving this one would have each re-login kill the other's token.
`hivectl matrix create-user` refuses an agent's name and says where its
account comes from. Everything that still uses the hive's appservice token
stays: the hive's own account, the Space and chat room, and operator
accounts.
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