The U.S. trade representative is expected to soon post text online that will lay out more of what Mexico has agreed to so far in the renegotiation of the North American Free Trade Agreement.While Robert Lighthizer portrayed the preliminary agreement in principle announced in late August as exclusively bilateral, it may include at least a dozen chapters reportedly closed between all three NAFTA partners.That means that at least indirectly, the document expected online sometime Friday or over this weekend may reveal more than has been previously confirmed about Canada's negotiations to date.Mexican . . .