Mary Jannotta sliced meat and cheese behind deli counters at Acme and Pathmark supermarkets in the Philadelphia suburbs for decades, developing aches that came with working on her feet. A botched back surgery in 2008 made the pain worse. Her doctor repeatedly prescribed OxyContin, Purdue Pharma’s marquee painkiller — the high-dose opioid the company later admitted it criminally marketed and distri...