v0.7.0: key bindings — TDD (RED→GREEN)

Ctrl+U clear line, Ctrl+W delete word, Ctrl+A/E home/end,
Ctrl+L redraw, Ctrl+D quit empty, Ctrl+X+E editor.
2 TDD tests (3 assertions), 100% pass.

Fixed paren bug in init-state (:dirty outside list).

org/channel-tui-state.org

@@ -132,6 +132,7 @@ See *tui-theme-presets* for named presets (dark, light, solarized, gruvbox).")
               :input-buffer nil :input-history nil :input-hpos 0
               :messages (make-array 16 :adjustable t :fill-pointer 0)
               :scroll-offset 0 :busy nil :cursor-pos 0
+              :pending-ctrl-x nil
               :dirty (list nil nil nil))))
 #+end_src