Tuesday marked the official return of Marine Johannès, who finally re-signed with the Liberty. The plan was always for Johannès to be back with the Liberty this season. She was a reserved free agent, meaning New York had exclusive negotiating rights with the French guard. Finalizing her one-year, minimum contract (worth $277,500) was one of the last major boxes the Liberty needed to check off to finish free agency. Johannès said her delayed signing was nothing more than her wanting to wait until she got to Brooklyn to make it official. Now that it’s behind her, she’s eager to integrate herself into New York’s new motion offense, which should bode well for her. In a lot of ways, Tuesday felt like the first day of school for Johannès. She came to Barclays Center with renewed excitement after a disappointing finish to last season. “I’m really happy,” Johannès said after her first practice.…