It began as a day spent engaged in spring cleaning. It ended the next morning in the death of a Plymouth woman. And now, two top doctors from Massachusetts General Hospital have agreed to pay the woman's family $4.5 million because, a medical malpractice lawyer said, the physicians failed to take measures that might have prevented the death. Geraldine Moran, 62, was cleaning her home on March 23, 2005, when she fell off a 6-foot-tall ladder and broke several ribs, according to the attorney for her estate, Benjamin Novotny of the Boston law firm Lubin & Meyer. Moran was taken to Jordan Hospital, now known as Beth Israel Deaconess Hospital-Plymouth, where she received a high-tech medical scan of her pelvis and chest.