ATLANTA — Beginning this weekend, Christian Coleman loses the title of world’s fastest person in exile. He’s freed to run in public again, his 18-month suspension for missing three spot doping tests in 2019 expiring Sunday. The Atlanta-born sprinter, who would have been the 100-meter favorite in last summer’s Olympic Games in Tokyo had he been clear to compete, now looks to regain his place at the apex of human speed. Such rare speed is particularly fleeting. And the suspension ripped a huge hole in a precarious career. Still, all he lost during his suspension, Coleman, 25, is confident he’ll …