docs: def next(self):
          """Trigger next agent to :py:meth:`~creamas.core.CreativeAgent.act` in
          the current step.
          """
          # all agents acted, init next step
          t = time.time()
          if len(self._agents_to_act) == 0:
              self._init_step()
  
          addr = self._agents_to_act.pop(0)
          aiomas.run(until=self.env.trigger_act(addr=addr))
          t2 = time.time()
          self._step_processing_time += t2 - t
  
          # all agents acted, finalize current step
          if len(self._agents_to_act) == 0:
              self._finalize_step()