R-1254 (controller half): escrow claim/confirm outwait the agent (60 s); an unknown confirm outcome promises nothing

504 from the agent (it cannot learn which package the hub holds) or a failed call -> api.escrow.confirm_store_unknown
(hu+en); only 502 keeps 'your previous code still works'. Tests TestR1254_* red before the fix. Commit only.

controller/internal/web/r1151_escrow_confirm_test.go

@@ -93,7 +93,9 @@ func TestR1151_ConfirmAnswersInTheBoxLanguage(t *testing.T) {
 		{http.StatusGone, http.StatusGone, true, "Lejárt az idő", "has run out"},
 		{http.StatusNotFound, http.StatusGone, true, "már nem vár megerősítésre", "no longer waits"},
 		{http.StatusBadGateway, http.StatusBadGateway, false, "nem sikerült elmenteni", "could not be saved"},
-		{0, http.StatusBadGateway, false, "nem sikerült elmenteni", "could not be saved"},
+		// R-1254 H2 (2026-10-28): a failed call (0) or an agent that cannot learn the outcome (504) promises nothing.
+		{0, http.StatusGatewayTimeout, false, "Nem tudjuk biztosan", "cannot tell yet"},
+		{http.StatusGatewayTimeout, http.StatusGatewayTimeout, false, "Nem tudjuk biztosan", "cannot tell yet"},
 	}
 	for _, c := range cases {
 		for _, lang := range []string{"hu", "en"} {