CHARLOTTE, N.C. — Three days into free agency, the Charlotte Hornets finally have their first move. Restricted free agent Cody Martin has agreed to terms on a four-year, $32 million deal, sources with direct knowledge of the situation told the Charlotte Observer on Saturday. Bringing Martin back was among the team’s top priorities. Martin is one of their best defenders and was typically the first player summoned off the bench, showing off growth in his third season. He appeared in 71 games, starting in 11, and averaged 7.7 points and four rebounds per game. Both sides had mutual interest from …