Sometimes, Michiko Kato thinks back on the great challenges of her life.  She once dropped everything in her native city of Tokyo to attend Harvard Business School in Massachusetts. One day, she decided to leave her career in the stable world of finance to enter the rocky terrain of startup life. That jump is what changed everything. On Wednesday, Kato officially assumes her greatest challenge yet — CIO of Toyota’s Woven Capital and CEO of Toyota Invention Partners. The latter appointment makes