Site / With Remote and SSR

Who owns what

Concern	Owner	What it does not do
The address and its route value	Foldkit's Router	Know anything beyond one address
The tree of places: titles, sections, history, head metadata, which Surface each place activates	`foldkit-site`	Hold state, fetch, or render
The route field, and every change to it	the application's Model, through `update`
What a page reads	a Surface (`foldkit-surface`)	Fetch: it only declares
Server facts: the store, what is missing, fetching, retention	`foldkit-remote`	Know about routes or pages
The handover from server to browser, and the checks that it is whole	`foldkit-ssr`	Own any state; data crosses through Remote's own part
Joining the pieces into one `update` and one runtime config	`foldkit-bundle`	Decide anything the pieces decide

Each fact has one owner, and the others read it. The Site never reads window.location; the route is a Model field. Remote never looks at the route, only at which Surfaces are active. SSR never fetches; it checks that what the page reads crossed with it.