JACKSON, N.J. — What appeared to be a completed transaction to sell the former Christa McAuliffe Middle School has instead emerged as an unfinished deal facing unanswered questions over zoning, municipal approvals, and public transparency. The Jackson Board of Education voted in December to approve the sale of the former middle school at 35 South Hope Chapel Road for $40 million. The buyer has been widely identified as Beth Medrash Govoha (BMG), the Lakewood-based Orthodox Jewish rabbinical college and one of the world’s largest institutions of advanced Jewish learning. The district has repeatedly described the sale as a key component…