As a shareholder in Central Wisconsin Anesthesiology S.C. and member of its board of directors, Dr. Linda Bluestein got to vote on a proposal to terminate her employment contract. After losing that vote, Bluestein sued the corporation for allegedly violating three statutes that protect “employees” — the Americans with Disabilities Act, the Rehabilitation Act of 1973 and Title VII of the Civil Rights Act of 1964. But a federal judge — concluding Bluestein was an employer — granted Central …