With four neck surgeries and a year on the shelf behind him, Peyton Manning will be subjected to someone counting his throws as he learns the Denver playbook. Manning has been cleared by the Broncos’ medical staff and by his surgeon from his most recent procedure, noted neck and spine specialist Dr. Robert Watkins, to participate fully in the Broncos’ offseason workouts and training camp. But that doesn’t mean the Broncos aren’t monitoring the most notable free-agent signing in team history. Manning and the Broncos’ longtime head trainer, Steve “Greek” Antonopulos, have worked out a throwing schedule. … “We’re going to monitor his reps on a daily basis, how many throws he has,” Broncos offensive coordinator Mike McCoy said Thursday.