It’s official. The Moxie Agency is open for biz. Not that Sophie Zunz, Regan Dillon and Jo Swani (profile 2/26/08) have been eating bonbons for the past few months. Ney, ney, the trio has been busily working with fashion designer Daniela Corte, chef Lydia Shire and the forces behind the Liberty Hotel, among many other movers and shakers. Boston’s luminaries sipped champagne atop the penthouse deck of Fort Point Channel’s FP3 residences to celebrate – not that you need a reason to party if you’ve got moxie.