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The fork button on a stopped assistant message was inert. Frozen interrupted nodes carry a flow-ordering seq of turnEnd.seq - 0.9, and session.fork takes a non-negative integer on the wire, so every such request was rejected as invalid-params before reaching the host — where an aborted turn's logged turn/end has always made it forkable. SessionsService.fork floors atSeq at the wire boundary. Flooring stays inside the anchor's own turn (every turn opens with turn/start), so the host's first-turn/end-at-or-after cut still closes on that turn.