TALLAHASSEE — Attorneys for people with disabilities have filed a federal lawsuit alleging the Florida Agency for Health Care Administration has not provided adequate oversight of Medicaid managed-care plans that care for people in their homes. The 79-page lawsuit, filed Monday in Tallahassee, centers on part of Florida’s Medicaid system that contracts with managed-care plans to provide what are known as home- and community-based services for people who need long-term care.