v1.0.0: add char-width and search-highlight to cl-tty library

char-width → cl-tty.box (text.lisp): terminal column width for Unicode
  characters including CJK, emoji, combining marks, and tab.

search-highlight → cl-tty.markdown: wraps query matches in **bold**
  markers for search result emphasis. Pure function, zero dependencies.

org/box-renderable.org

@@ -591,3 +591,33 @@ word list iteratively. Consecutive delimiters are collapsed
                    (setf start len))))
         finally (return (nreverse words))))
 #+END_SRC
+
+** char-width utility
+
+~char-width~ returns the terminal column width of a character.
+ASCII < 128 = 1. CJK, fullwidth, emoji = 2. Combining marks = 0.
+Tab = 8. Used by layout calculations that need to handle
+variable-width characters.
+
+#+BEGIN_SRC lisp :tangle ~/.local/share/cl-tty/src/components/text.lisp
+(defun char-width (ch)
+  "Returns the terminal column width of character CH."
+  (let ((code (char-code ch)))
+    (cond
+      ((= code 9) 8)
+      ((< code 32) 0)
+      ((<= code 127) 1)
+      ((<= #x4E00 code #x9FFF) 2)
+      ((<= #x3400 code #x4DBF) 2)
+      ((<= #x3040 code #x309F) 2)
+      ((<= #x30A0 code #x30FF) 2)
+      ((<= #xAC00 code #xD7AF) 2)
+      ((<= #xFF01 code #xFF60) 2)
+      ((<= #xFFE0 code #xFFE6) 2)
+      ((<= #x1F300 code #x1F9FF) 2)
+      ((<= #x2600 code #x27BF) 2)
+      ((<= #x0300 code #x036F) 0)
+      ((<= #x20D0 code #x20FF) 0)
+      ((<= #xFE00 code #xFE0F) 0)
+      (t 1))))
+#+END_SRC