Joan Williams makes rounds in Harlem. She is the executive director of the Beth Hark Christian Counseling Center in Harlem and goes out in the church van monthly to deliver food to addicts and the homebound. It only took one interaction set her on a path toward changing the way food aid is distributed in New York City. “It broke my heart. I went out and saw someone who was addicted to crack — who didn’t feel comfortable coming into an institution….