WASHINGTON — The Biden administration’s top Supreme Court lawyer eats a bunch of bananas. Other advocates play music to psych themselves up. Some rub the feet on John Marshall’s statue a floor below the courtroom.The Supreme Court, which begins its new term on Monday, is awash in ritual. So it’s no surprise that the lawyers have a few regular, if occasionally eccentric, observances of their own.Arguing at the court can be both intimate and intimidating. Lawyers stand at a lectern that’s …