v0.2.0

A fresh install now does something out of the box, and the app tells you what
it just did.

• Hammerdeck ships as a disk image. Open it and drag Hammerdeck to
  Applications, the way a Mac app is meant to arrive.
• The window suite ships enabled. A first launch used to boot with almost every
  feature switched off, so a new install did nothing until you configured it.
  The curated spine -- the six window features, Pointer Follows, and the two
  that show what fired -- is on from the start.
• First run walks a golden path: an empty deck offers one button to refill it,
  the Accessibility ask explains why it is needed before asking, and the last
  step names a shortcut to try.
• Hammerdeck has a menu bar. About, the version, Settings, Check for Updates,
  Quit -- and, because AppKit delivers them nowhere else, working Cmd-X / Cmd-C
  / Cmd-V / Cmd-A in every text field in the app.
• Open at login, off by default, in Settings > General.
• Receive beta updates, also off by default and in the same place. Every
  release is offered there first, before it goes out to everyone; turn it off
  at any time to go back to the general releases.
• Reload Features and the extensions folder report what happened. An empty
  folder, a wrong layout, and a folder whose extensions were all rejected used
  to render as the same nothing.
• One window mode per screen. Entering Window Fan over Window Deck used to
  record the deck's grid as your "original layout" and left the real one
  unrecoverable.
• The Window Fan switcher card is resizable and remembers its size.
• A copy pointed at a test update feed says so, and offers the way back.
• The update dialog carries release notes. Earlier versions showed an empty
  panel at the moment you decide whether to trust an update.
• A failed launch names the error, copies it to the clipboard, and writes it to
  the log -- and restores the Caps Lock remap it used to leave in place until
  the next reboot.

Also: a repository-wide audit and the fixes it found, across the rules engine,
window membership, the extension capability gate, and the seam.