SITUATION EXPLAINED: Trump is moving 3 senior officials from CAISSI, the government's AI testing agency, into the White House. • They'll report to Michael Kratsios and National Cyber Director Sean Cairncross, after coordination problems with Commerce • It's the agency's 3rd shake-up in under 2 years, from Biden's AI Safety Institute to Trump's CAISI to today's CAISSI • It runs on about 40 staff and $15M a year, less than some individual researchers at AI labs make • Its staff work from NIST's…