Panewright 0.6.23

Fixed

• Restarting the environment no longer multiplies the machinery
  (issue #17). Every restart re-armed the periodic jobs without stopping
  the previous set — three restarts meant three health loops, three orphan
  sweeps, and three display handlers racing each other through workspace
  redistribution: the flicker storms, and windows left stranded off to the
  side, were the app fighting its own clones. Every start is idempotent
  now; restart as often as you like, there is always exactly one of each.