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bullpen_participant harness: a chatty agent holds the stick when the latest chat is addressed to it, replies (persona LLM), and hands the floor on. Talking-stick enforced: parse-fail/unknown/offline -> yield to human; >=TURN_CAP consecutive agent turns -> forced yield (storm-guard). Two example conversants (architect/skeptic) verified debating a real design question with clean stick-passing + default-to-human. Wired only when you want the society to converse; on-demand visit/ask/leave needs none of this. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>