This powerful and moving debut from writer and director Boaz Yakin may have a 12-year-old protagonist, but you won't mistake it for Disney. Fresh, played with riveting intensity by Sean Nelson, runs heroin and crack after school, then goes home to the Brooklyn, N.Y., projects where he lives with his Aunt Frances (Cheryl Freeman) and 11 cousins. His junkie sister, Nichole (N'Bushe Wright), has moved in with her abusive boyfriend. Fresh has been warned against seeing his homeless dad, Sam (Samuel