ATLANTA — A line of Ritz-Carlton employees stretched down the hotel hallway, and applause erupted as a group of public school educators walked by. The Ritz-Carlton Hotel Co. uses the “wall of applause” to show appreciation — a central message during a training session with Georgia education officials working on a broad initiative to create family-friendly schools. With research showing a clear link between parent engagement and student success, education officials say it’s essential that parents are involved, and they must make sure families feel welcome at schools that can sometimes feel like fortresses.