When Jessica Ney stopped by his office one morning in March, Joe Quinn thought she looked happier than he’d ever seen her. She’d just gotten out of rehab for her heroin addiction and couldn’t wait to get her life restarted, she told Quinn and other outreach workers at Pathways to Housing, the innovative Philadelphia program that helped her get a place to live even before she got sober. Quinn tried to coax her to stay for a group therapy session he was about to lead.