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feat(observe): the route the document arrived on — NavigationRef.initial, NavigationRef.interaction, RenderEvent.route (#3683)

A router declares its initial match with the call it already uses for
navigations, on both sides: `withOrigin({ kind: "navigation", initial:
true, … })` around the work that builds its context. Client: the engine
opens the frame at the time origin, takes no `from`, settles it on the
no-write rule — the first "navigation" record, `initial: true`, kept
out of the feedback fold. Server: the server entry's `withOrigin` files
the ref through the render context (`_declareRoute`) and the request's
"render" record carries `RenderEvent.route` — the `http.route` a
consumer names the request by.

`NavigationRef.interaction`: a router that awaits before writing hands
back the origin it captured with `currentOrigin()`; declared beats
ambient, the key's presence is the declaration.

Prod artifacts byte-identical; observe client artifacts byte-identical
(tier cap +25 B of mangler layout); engine +122 B.

Co-authored-by: Claude via Cursor <cursoragent@cursor.com>

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