Audrey Stone, who was laying in a hospital bed high in the Danbury Hospital tower, spoke quietly about her six-year companion, Figo, the 8-year-old golden retriever that sprang between the legally blind lady and an oncoming mini-school bus in Brewster on Monday. “He needs the Purple Heart from the president,” Stone joked. Figo (pronounced FEE-go), Stone’s third service dog, is …