WASHINGTON — The Supreme Court keeps secrets. Year after year, in major case after major case, there’s little beyond what the justices say during oral arguments that suggests how they will rule until they actually do.That is until Monday evening, when Politico published a draft of an opinion in a major abortion case that was argued in the fall.Lawyers and others who watch the court closely were shocked. Neal Katyal, who has argued dozens of cases before the court and as a young lawyer worked for Justice Stephen …