Settle Brain Dump Plan

The plan step's content: what Otto heard, the team, and the tasks.

ready is false only while the background jobs are still running; the tasks and team it carries then are the role plan, so a client that stops waiting has something true to show, and progress says how far the jobs have got. source is "llm" for a plan built from the tasks the greeting wrote (ranked by Jev or by the deterministic fallback) and "fallback" for a default set: the role sets, or the generic starters.