The subagents list reads each subagent's status from the subagent-status
bucket and reports its state, when it began and the exit status. A subagent
with no status keeps the newest-row lookup, so an older daemon lists as before.
The swarm UI uses the state when there is one and the row-age guess otherwise.
The subagent daemon stamps Swarm-Model and Swarm-Effort on each row it
publishes. The list endpoint reads them off the newest row it already fetches,
so a long-running subagent keeps them past the stream's 24 hour window, and the
terminal page's menu and the agent panel's list show them beside the name.
An N running subagents badge opens a list of the agent's subagents, each a
link to its terminal, so you can switch without going back to the agents page.
A subagent counts as running when it published a row in the last 15 minutes;
the quiet ones are listed below it, dimmed. The list under the preview and the
menu now share one fetch hook and one definition of running.
