Two men were found murdered on the Chihuahua–Aldama corridor before dawn Thursday. One had been decapitated. A cardboard message left at the scene referenced a faction of the Sinaloa cartel. Police quickly sealed access roads and set up roadside checks around the capital’s eastern ring. Local sources say the victims may be two brothers who vanished earlier this month—but officials have not confirmed identities. What the message said, how the grou…