Door remains unlocked at NYCHA building where killer strolled inside

Door remains unlocked at NYCHA building where killer strolled inside
Add dangerously lax security to the laundry list of problems — lead paint, no heat and toxic mold — plaguing tenants of the city’s public housing. More than a year after a mentally unstable man waltzed right through a front door of the Jackie Robinson Houses with a broken locking mechanism and stabbed to death…