Every view of a document agrees on where the reader is.
Below are four views of one document: an editor, an outline, a preview and a minimap. None of them calls another; each reports to one Fuoco hub. Click a line in the editor and watch the other three follow, then pick a heading in the outline. Switch to a transcript or a code file: the same four views work unchanged. The log shows every move, who made it, and who heard it.
Click anywhere in the editor, the outline, the preview or the minimap. The other three follow.
Each beat drives the stage above through the public API it names.
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