The agent roster page opened with how an agent comes to exist (the identity
store, swarmctl, the swarm UI, the ruth archetype), which is the swarm's
doing. That text now sits in a "Who is on the roster" section of the swarm
page, and the roster page keeps what is a hive's and an agent's: the hive's
own list, who may reach whose state, and that the manager is a normal agent.
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