- Use buffer-ring package to power buffer mode
- Use a separate buffer ring in meta tower mode to support
  clean use of side effects over the underlying mode in
  metacircular operation
- Use persistent buffer ring to manage buffers more precisely
  instead of relying on Emacs's built-in buffer navigations
- Begin an Emacs customization group for rigpa
- Window: ability to transpose the window configuration
- Keybinding guardrails for tower mode exit in readme config
- Safely set monospace font for meta modes (for #6)
- Add ability to change font in application mode
- Other minor fixes and improvements