Composes the producers mapped on #86106 into one regression against the real
cache, session-actions and prompt-actions hooks plus the production
owner-routing dispatcher (gateway edge mocked, no injected bindings):
A active -> B queued send -> user focuses tile C -> B runtime reaped ->
A's delayed stored-id rotation -> B drain (text + image) -> B recovers
On origin/main the rotation consumer navigates the primary to A-next while
the user is on tile C (route/focus steal); with the #86359 gate the user stays
on C, B's attachment and prompt reach connection-B on B's recovered runtime,
and every stored id maps to exactly its own runtime.
806a86ae7d