Fermentation has spies everywhere. We learned today that Sir Mick Jagger took a swing into Napa Valley last night to dine at the Mich 3-star French Laundry. Thomas Keller, owner of the French Laundry was on hand for the visit from Jagger. Jagger was seen in the company of his current object of appreciation, L’Wren Scott. Concerned that he was in Napa Valley, Jagger apparently pointed out to the sommelier that he wanted to drink California wine, not French. (Good…