— By Jen A. Miller • For the last 10 years, technical writer Valerie Juzwiak’s health insurance has been a patchwork because of her temporary contract employment. Sometimes an employer provides coverage; if not, Juzwiak buys her own, and premiums are as high as $600 a month. Juzwiak, 52, of Somerset, is looking forward to less cobbled-together insurance coverage beginning next year. She’ll be one of the thousands of New Jersey residents buying a policy through the marketplace set up by …