By Cam Inman From Mercury News Fred Warner absolutely should pan out as the 49ers’ latest, highly paid linebacker. Which would be a welcome change. Malcolm Smith, Reuben Foster and Kwon Alexander sure didn’t, not after this current regime anted up for them in 2017, ’18 and ’19, respectively. Warner’s first three seasons earned him not only a raise but a market-setting salary among linebackers. He’s agreed to a five-year, $95 million contract extension with $40.5 million guaranteed, NFL Network’s Mike Garafolo first reported. Warner and all 49ers are slated to report for training camp July 27. The 49ers and Warner’s agent have yet to publicly confirm the deal. Warner is the prototype of a modern-day linebacker, as opposed to the old-school version known for punishing hits when looser rules allowed them. He has range, he’s instinctive, he’s intelligent, he’s a sure tackler and he’s an organically grown captain. He’s …