Ann Claire Williams is facing a seismic change in her world.After serving as a federal judge for more than 32 years — first on the trial court and then on the appeals court — Williams is stepping down from the bench.But she is confident she will not lose her footing.“Everything will change,” Williams told the friends, relatives and colleagues who packed into the ceremonial courtroom at the Dirksen Federal Courthouse on Friday to celebrate her judicial career.“But what will not change is my …