Bradley Woehl and his progeny on the goGary Fisher, the local mountain bike luminary whose name is plastered on hundreds of thousands of bicycles worldwide, has endowed a San Francisco chair in kid fun, reports local bike shop owner Bradley Woehl.Well, it's not exactly a chair, as the accompanying photo demonstrates, but rather an enclosed bench seat at the front of a special Bakfiets brand Dutch-made bicycle. Fisher, whose enthusiasms have lately encompassed urban as well as wilderness cycling,