Early next year, Julian Assange says, a major American bank will suddenly find itself turned inside out. Tens of thousands of its internal documents will be exposed on Wikileaks.org with no polite requests for executives’ response or other forewarnings. The data dump will lay bare the finance firm’s secrets on the Web for every customer, every competitor, every regulator to examine and pass judgment on. ... Sitting for a rare interview in a London garden flat on a rainy November day, he compares what he is ready to unleash to the damning e-mails that poured out of the Enron trial: a comprehensive vivisection of corporate bad behavior.