A Sept. 11 trial prosecutor on Thursday read aloud ghastly descriptions of what the CIA did to its prisoners: An alleged plot mastermind was taken nude from interrogation to a medical officer, who put fluids up his rectum then returned him nude to interrogation. Some captives were kept like “cowering dogs,” subjected to standing sleep deprivation, abdominal and facial slaps, in what one CIA agent called a “nightmare.” Prosecutor Jeffrey Groharing read the descriptions…