Brock Purdy’s stint as the 49ers’ starting quarterback in the regular season was brief, but his productivity in five starts and a sixth game where he took a majority of the snaps under center was successful enough to earn him All-Rookie honors from the Pro Football Writers of America. The PFWA listed Purdy as the QB on the 27-player roster that includes 11 on offense, 11 on defense and five special teams selections. Purdy came on in Week 13 when Jimmy Garoppolo suffered a broken foot. He completed 25-of-37 throws for 210 yards with two touchdowns and one interception while…