THROUGHOUT THE SUMMER, and as we head into the colder months, Massachusetts’ daunting housing challenges have received no shortage of coverage. Our lack of affordable market-rate housing is highlighted monthly in data that show high median prices, low supply, and a severe shortage that limits the ability of people of more modest means to find decent housing of any kind. But while the systemic crisis gets the attention, our homelessness data illustrate some important stories that don’t make headlines, like Joe’s.