From president to prisoner: The rapid descent of Peru's Pedro Castillo Enlarge this image toggle caption Fernando Vergara/AP Fernando Vergara/AP LIMA, Peru — Perhaps the most telling detail of Pedro Castillo's botched coup attempt this week was the fact that the high-stakes gamble may have been completely unnecessary. Enlarge this image toggle caption Carlos Garcia Granthon/Fotoholica Press/LightRocket/Getty Images Carlos Garcia …