KEENE, N.H. — In most places, the parking enforcement officer reflects the municipal compact. Armed only with a gadget that can spit out a ticket at the forgotten drop of a dime, the officer quietly serves civic and commercial life by ensuring that meters are fed. In most places, yes. But not here in charming Keene, where parking officers figure in a philosophical tug of war between a small band of activists who live by the motto “Free Keene,” and the great majority of residents who were unaware that their city was in bondage. Keene’s two parking officers, both women,...