Head-high pallets of hand-bottled beer rolled out of the loading bays at Left Nut Brewing Co. for the first time last week. On Thursday, bottles of pale and blonde ales left the Atlanta Highway plant bound for Gainesville grocery and package stores — a milestone for the company that hit its first anniversary in March. “That’s a big checkpoint for us in our longevity — or our life, our lifespan here,” said brewery owner Pap Datta on Thursday.