praktika pilot→expired role in roles.yaml (paths:[], deny:/**); RouteGuard
short-circuits on role=expired with a dedicated trial-ended screen (not the
generic path-deny path). NoAccessScreen gains variant="trial" with title
«Пробный доступ закончился» and a Telegram link to @ArtemKopylov87. Backend
Role Literal and frontend Role type extended to include "expired". kopylov
(pilot) unaffected.
