By Andrew Gould Most of Derek Carr’s eight years with the Raiders have involved speculation over his long-term status as the team’s franchise quarterback. That appeared to change when the Raiders awarded him a three-year, $121.5 million extension after Carr led them to a playoffs with a career-high 4,804 passing yards. Last week, Josh McDaniels made it clear the team is committed to Carr as the starting quarterback despite working out Colin Kaepernick. During Thursday’s press conference, via Pro Football Talk’s Myles Simmons, Las Vegas’ first-year head coach praised Carr’s football IQ and lead…