In his freewheeling first year in office, Howard Lutnick, a 64-year-old billionaire, has emerged as a commerce secretary unlike any other in recent memory. He has boasted of using the power of the federal government to benefit taxpayers at home and abroad. The tactics Mr. Lutnick has used to pressure foreign governments and private companies alike were honed during his time on Wall Street. After decades at the helm of the investment firm Cantor Fitzgerald, he had earned a reputation as an