History will whisper through the mountain mists that once upon a time, Pactiv Evergreen’s paper mill in Canton stood as a symbol of industry and economic prosperity for generations. But behind its towering façade, the specter of mismanagement and malfeasance eventually led to a botched closing announcement, a health care coverage crisis and more than a thousand workers helplessly watching their good-paying jobs evaporate like morning dew in the midday summer sun.