By THÉRÈSE MARGOLIS     On the morning of Friday, Feb. 15, Mexican President Andrés Manuel López Obrador (AMLO) eagerly presented his four-punch bailout plan to save the country’s financially lethargicm state-run oil company Petróleos Mexicanos (Pemex) from economic collapse. By that same afternoon, at least three international financial institutions and one of the “Big Three” global credit rating agencies had declared