For a meager grocery store, Trader Joe’s has a supernova persona. It’s not Whole Foods, a culinary Neiman Marcus whose prices can leave you feeling mugged. It’s not Fresh & Easy, where Home Depot-style savings have been passed along by replacing workers with DIY checkout scanners. It’s certainly not Ralphs. We prize Trader Joe’s because it has auspiciously pulled off being none of the above. Yes, the parking lots are a misery, the store passageways a....