Today may be Sept. 1, but Monday is la rentrée–the great return to school, to work, to routine. For winemakers around this part of the south of France, the end of summer comes with le vendange, or grape harvest, and they are hard at it.At night, a welcome cool breeze slips through the open windows, along with the low growl of harvesting machines already toiling as early as three a.m. Wayward grapes stain the sidewalks and streets of the village. Within the time we’ve lived here, the harvest has gone from being all-hands-on-deck to being something that happens in our peripheral vision. The fête du village is always Aug. 15, a last fling before grindingly long days of harvesting. The village gym class didn’t start until after the vendange, because nobody had time for exercise when the vineyards were in full swing. Eventually, only two gym-goers were working…