A pure-Chinese continuation like continuing the remaining pages never
matched the ASCII keyword gate in loop_enabled, so it fell through to
the classic orchestrator even when the canvas already held a 390px
mobile screen. Feed a canvas signal (an existing mobile-width top-level
frame) into the routing decision, explicit overrides still win. Also
surface the parallel-agents setting to the design loop model as a
prompt fact and tie the spawn_agents guidance to it instead of a dead
3-4 screen threshold, so the picker setting has honest semantics.
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