"The Commission declines to extend the reach of the final rule to restraints on concurrent employment. Although several commenters raised this issue, the evidentiary record before the Commission at this time principally relates to post-employment restraints, not concurrent employment restraints. The fact that the Commission is not covering concurrent-employment restraints in this final rule does not represent a finding or determination as to whether these terms are beneficial or harmful to competition. The Commission relatedly clarifies that fixed-duration employment contracts, i.e., contracts between employers and workers whereby a worker agrees to remain employed with an employer for a fixed term and the employer agrees to employ the worker for that period, are not non-compete clauses under the final rule because they do not restrain post-employment conduct."