0.6.22

Added

• ios_release_screenshot config — opt mob's public-API screenshot NIF into
  release builds. Companion to mob 0.7.20 (mob#71), which carves screenshot/3
  into #if !MOB_RELEASE || defined(MOB_ENABLE_SCREENSHOT). Setting
  config :mob_dev, ios_release_screenshot: true exports MOB_ENABLE_SCREENSHOT=1,
  and the generated release_device.sh compiles mob_nif.m with
  ${MOB_ENABLE_SCREENSHOT:+-DMOB_ENABLE_SCREENSHOT} — so a release build can ship the
  screenshot NIF (letting an agent SEE a shipped app's screen to error-correct) while
  the private synthetic-input NIFs (tap/type) stay stripped. Default is unchanged and
  byte-identical (screenshot stays stripped); enabling it is a deliberate choice because
  the NIF captures the app's own window with no OS prompt or indicator. (#39)