Puerto Vallarta is switching to holiday mode and safety mode at the same time. City officials say patrols will cover cemeteries, altars, and the main routes as Vallarta Día de Muertos begins, a long weekend that fills the Malecón and the 5 de Diciembre cemetery with families and visitors. Behind the scenes, state health brigades are also working the panteones to cut dengue risk, a quiet but crucial layer of the operation. Here’s what’s planned, w…