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First deployment carrying the injected wallet and the external data layer. A user signs in and sees their own data. That settles the one link in the chain nothing here had ever exercised: a deployed origin CAN be embedded in the hosted broker's iframe. The identity flow runs the application inside that iframe, so data reaching a signed-in user is proof the embedding works for this origin. It is settled by the deployment, not by a test, and the doctrine now says so: no scenario covers it, so a change of origin, of proxy, or of the broker's embedding policy would be found by a person rather than by the suite. Worth stating plainly what this deployment is: the first one able to sign anybody in at all. The production bundle never asked for its runtime configuration under NODE_ENV=production, so it had neither password nor wallet to hand the data layer, and the failure was invisible from outside — the server answered, the page rendered, and nothing was wrong except that nobody could get in.