By Diego Oré MEXICO CITY – A major hack into classified government information in Mexico, including thousands of emails from the armed forces, exposed the country’s vulnerability to cyberattacks due to under-investment and poor technological preparedness, experts said on Friday. President Andres Manuel Lopez Obrador confirmed on Friday the Defense Ministry had suffered a hack that revealed details about his heart condition – a form of angina – as well as information on criminal figures, transcripts of communications, and the monitoring of the U.S. ambassador to Mexico. A group called “Guacamay…