It sounds like something out of Homeland: at a secret location somewhere off the campus of the CIA, the agency leases a space and hires contractors to run a top-secret network, which it fills with millions of pages of documents dumped from the agency’s internal network. But that’s apparently exactly what the CIA did for more than three years as part of an agreement to share data with the staff of the Senate Select Committee on Intelligence on its controversial detention and interrogation program.....