Briton Alex Yee and local heroine Cassandra Beaugrand swam in the Seine, which was finally declared safe, before cycling and running on the Champs-Élysées boulevard to Olympic triathlon gold medals in contrasting styles on Wednesday. Yee produced a finish for the ages in the men’s race when he came from behind in the final stages of the 10km run to storm past New Zealand’s Heyden Wilde and cross the line at Alexandre III bridge six seconds ahead. France earned bronze from Leo Bergere, and the hosts had even more reason to cheer earlier on when Beaugrand shook off days of uncertainty around the…