Nick Sirianni, Jalen Hurts, and Matt Leo are familiar with the 49ers’ QB, who will try to be the first rookie to win an NFC championship after four others have tried and failed PHILADELPHIA – Brock Purdy is doing things that no other quarterback in recent memory has done, and that is winning their first seven starts as a rookie. Tom Brady didn’t do it. Nor did Joe Montana. Now, it could be said it’s not how you start a career, it’s how you finish, and Purdy has a long way to go. Still, a 7-0 start to a career…