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/scripts/i18n_go_keys.json

@@ -5,6 +5,7 @@
     "api.escrow.confirm_expired": "BORN AS A KEY (R-1151, 2026-10-19) -- a NEW sentence, never a Go literal: the wizard's typed-back confirm answer (agent >= 0.160.0 keeps the new package until the words come back). Pinned by TestR1151_ConfirmAnswersInTheBoxLanguage.",
     "api.escrow.confirm_lost": "BORN AS A KEY (R-1151, 2026-10-19) -- a NEW sentence, never a Go literal: the wizard's typed-back confirm answer (agent >= 0.160.0 keeps the new package until the words come back). Pinned by TestR1151_ConfirmAnswersInTheBoxLanguage.",
     "api.escrow.confirm_store_failed": "BORN AS A KEY (R-1151, 2026-10-19) -- a NEW sentence, never a Go literal: the wizard's typed-back confirm answer (agent >= 0.160.0 keeps the new package until the words come back). Pinned by TestR1151_ConfirmAnswersInTheBoxLanguage.",
+    "api.escrow.confirm_store_unknown": "BORN AS A KEY (R-1254, 2026-10-28 night) -- a NEW sentence, never a Go literal: the confirm's outcome is unknown (agent 504 or the call itself failed) -- no promise about the previous code. Pinned by TestR1254_AnUnknownConfirmOutcomePromisesNothing and TestR1151_ConfirmAnswersInTheBoxLanguage.",
     "waiting.title": "BORN AS A KEY (R-554, 2026-10-12) -- the title of the page an unconfigured box shows while it retries its configuration, replacing the deleted setup wizard. Pinned by internal/bootstrap TestWaitForConfig_ServesWaitingPageThenStarts.",
     "waiting.body": "BORN AS A KEY (R-554, 2026-10-12) -- the body of that waiting page. Pinned by internal/bootstrap TestWaitForConfig_ServesWaitingPageThenStarts.",
     "recovery_info.body": "BORN AS A KEY (R-554, 2026-10-12, `09` §3 decision 222) -- the NEW text of recovery-info.txt, pointing at the dashboard's Restore page and the recovery code instead of the deleted setup wizard. The operator approves the Hungarian before release. Pinned by internal/recovery TestRecoveryInfo_PointsAtDashboardNotWizard.",