HURRY UP AND EAT! As the $143 billion restaurant industry comes off its slowest year in a decade, it has a new item on the menu: shooing you out the door. To the dismay of diners who like to sit back and savor the cappuccino, high-end restaurants are turning to high-tech gadgets, efficiency experts and software to help cram as many customers into — and as much money out of — every single seating. The tactics go way beyond the usual glaring maitre d’. From reservation systems that automate a manager’s best guess of how long people will linger to...