Seahawks, QB Wallace agree on extension

Seneca Wallace isn’t going anywhere. The backup quarterback will still be with the Seattle Seahawks should something happen to starter Matt Hasselbeck. Wallace agreed to a four-year extension on Tuesday that will keep him under contract through the 2010 season. He was set to become an unrestricted free agent after the 2007 season, but is now locked up after agreeing to his second extension in 12…