Agents ask each other, hand each other work, and answer
An agent asks the agent on another pull request a question or hands it work with message_agent, naming its own pull request; the other receives it at its next step and replies with answer_message, which reaches the asker at its next step. If the agent asked is not at work, the asker is told straight away and pointed at the change to read. Agents are told their own pull request's number. Exchanges show on the outcome page with where they stand, and on both pull requests.
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