NEW YORK — “Proving Ground: The Untold Story of the Six Women who Programmed the World’s First Supercomputer,” by Kathy Kleiman When the world’s first general-purpose, programmable, electronic computer, known as ENIAC, debuted in 1946, great fanfare was given to the men who created it, John Mauchly and J. Presper Eckert Jr., among others. In “Proving Ground,” author Kleiman aims …