MIAMI — Juanita Castro, the sister of Cuban rulers Fidel and Raúl Castro who worked with the CIA against their communist government, has died in Miami at 90. Journalist María Antonieta Collins, who co-wrote Juanita Castro’s 2009 book, “Fidel and Raúl, My Brothers. “Juanita Castro was ahead of us on the path of life and death, exceptional woman, tireless fighter …