Joking that she might be suffering from a midlife crisis, Chronicle writer Joan Ryan announced in this morning’s edition that she will stop writing her column for a year in order to do more features, like her recent series “War Without End.” Ryan has been writing columns for 22 years, starting in sports, moving to lifestyle, op-ed and finally metro. “Maybe this is my little version of a midlife crisis, Ryan wrote. “I didn’t want to be 70 years old and look back on my career and wonder why I never tried different kinds of writing.