The flyTo() driver; absent during the first load's config pass.
Apply a waypoint's rendering patch (snake_case keys, validated path).
rendering
Publish a story event on the embedder bus.
Tell the sound layer (its on_depart / on_arrive nodes).
on_depart
on_arrive
Re-run the overlay manager's reveal pass (reveal: "on_arrival").
reveal: "on_arrival"
The flyTo() driver; absent during the first load's config pass.