passepartout: v0.7.0 — TUI Essentials: Terminal Parity

TDD cycle: contract → RED test → GREEN implementation for each item.

- Unicode width (char-width): 6 tests, 11 assertions. ASCII/CJK/emoji/combining.
- Status bar fix: timestamp right-aligned, focus at :x 1. No overlap.
- Ctrl key bindings: Ctrl+D/Q/L/U/W, Ctrl+A/E, Ctrl+X+E. 6 tests.
- External editor: Ctrl+X prefix state tracking + Ctrl+E chord.
- Deeper autocomplete: /theme subcommand, /focus directory, @ file paths.
- Scroll notification: :scroll-notify flag set when scrolled up on new msg.
- Pre-existing tests: messages init-state assertion fixed (nil→vectorp).

Remaining: scroll pads (needs Croatoan terminal), setup wizard (v0.8.0).

lisp/channel-tui-state.lisp

@@ -112,6 +112,8 @@ 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 :scroll-at-bottom t
+              :scroll-notify nil)
               :dirty (list nil nil nil))))
 
 (defun now ()
@@ -143,6 +145,9 @@ See *tui-theme-presets* for named presets (dark, light, solarized, gruvbox).")
 
 (defun add-msg (role content &key gate-trace)
   (vector-push-extend (list :role role :content content :time (now) :gate-trace gate-trace) (st :messages))
+  ;; v0.7.0: if scrolled up, set notification flag
+  (unless (st :scroll-at-bottom)
+    (setf (st :scroll-notify) t))
   (setf (st :dirty) (list t t nil)))
 
 (defun queue-event (ev)