The setup chat's last turn (the fork answer and the handoff) finished clean
on the free tier, so it was recorded as the first task. The offer then came
due three minutes after setup ended, which lands in the middle of the first
real task when that task runs longer than three minutes. Seen live on a
Windows dev build: first_task_at was the setup chat's end, not the task's.
Turns in the setup profile's sessions are no longer tasks, as the offer
module already intended ("normally the task setup hands off to").
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