WASHINGTONPRESIDENT BUSH'S emphasis on loyalty as opposed to stature has met its ultimate test. He has saved the biggest of his choices -- the anemic Treasury Department -- for last. The issue can be defined simply: Does he have the nerve to promote his chief of staff, Andrew Card, to the position Card appears to covet? And does he have the nerve to thumb his nose at the tut-tutters who would fault such an appointment on qualification grounds?Recent history would compel a "yes" to both questions, but in an administration in which secrecy is second only to loyalty, recent history...