Dialogue between an enquirer and an agent in this world; returns a map identical to enquirer except that its :gossip collection may have additional entries.

TODO: write docs

Return a world like this world but with this gossip moved to this new-location. Many gossips are essentially shadow-records of agents of other types, and the movement of the gossip should be controlled by the run function of the type of the record they shadow. The #run function below does NOT call this function.

Return a world like this world, with news items exchanged between gossip agents.