“I’m jealous you get to meet her,” an employee working behind the scenes at a recent press opportunity for “Daisy Jones & the Six” told some journalists. It was Taylor Jenkins Reid, the bestselling author behind a celebrity-infused, decades-spanning literary universe suffused with glitz and grit: “The Seven Husbands of Evelyn Hugo,” “Daisy Jones,” “Malibu Rising” and “Carrie Soto is …