HEALDSBURG — Sonoma County's first known Olympian may stand forever as its greatest. Ralph Rose, a giant of the sporting world in every sense, won three gold medals, two silvers and a bronze, spread over three Summer Games. He delighted big crowds at athletic exhibitions and set numerous records for strength, then became a city prosecutor. He also played the central role in an incident that ignited debate for decades and contributed to the passage of a federal law.