Anthony Tilghman’s daughter didn’t make it to the first day of summer school. The bus never showed up. The 4-year-old is enrolled in Prince George’s County Public Schools’ extended school year program for special education students.The program, which started Monday and serves more than 4,000 kids, is a free, four-week session designed to help students meet individual education goals. Students are promised breakfast, lunch and transportation to and from their assigned school.