DIED. Alain Chapel, 52, world-renowned master of French haute cuisine; of a heart attack; in St.-Remy-de-Provence, France. Chapel, who in 1973 at age 35 became the youngest master chef up to that time to win Michelin's coveted three-star rating, has lured thousands of gastronomic pilgrims to his restaurant in Mionnay, a town near Lyons. Among Chapel's culinary triumphs: gateau de foies blonds, a gossamer creation of baked mousse of chicken livers and beef marrow with a lobster-and-cream sauce, hailed by Craig Claiborne as "one of the absolute cooking glories of this generation."