Width and height argtypes, kdesc --argtypes from ref/, txt @define/@left_right/@columns, kdiag --check value validation (from dev d6993110e9b3)

Also: the klammertext argtype (descriptions kept as source), txt table
wrapping and :hpos/:offset, @c between ‹ ›, txt section headings, the
ktext newline-only trim, capitalize(), and the argtype test suite.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

sks/list/list.k

@@ -3,14 +3,24 @@
   :value 7
 @@@
 
-@@ul.k list_items.rest :cmp.bool false :bullet : Unordered list, with list elements preceeded by the *bullet* character. @@
+@@ul.k list_items.rest :cmp.bool false :bullet :
+  Unordered list, with list elements preceeded by the *bullet* character. @@
+
 @@ul.html,tex,txt :: @eval list.List(K, "ul") eval@ @@  
 
-@@ol.k list_items.rest :cmp.bool false :initial.int 1 : Ordered list, with numbered list elements. @@
+@@ol.k list_items.rest :cmp.bool false :initial.int 1 :
+  Ordered list, with numbered list elements. @@
+
 @@ol.html,tex,txt :: @eval list.List(K, "ol") eval@ @@
 
-@@define.k descriptions.rest(2) :style.style_code i : A list of words or phrases and their definitions or descriptions @@
-@@define.html,tex :: @eval list.Define(K) eval@ @@
+@@define.k descriptions.rest(2) :style.style_code i :
+  A list of words or phrases and their definitions or descriptions @@
 
-@@columns.k items :n.int 2 : Create two or more columns from the text @@
-@@columns.tex :: @eval list.columns(K) eval@ @@
+@@define.html,tex,txt :: @eval list.Define(K) eval@ @@
+
+@@columns.k items :n.int 2 :style.style_code r @hpos_args :hpos left @ :
+  Create two or more columns from the text.  Placed like a table: flush at
+  the left by default, ^:offset inset from that margin (a bare number is
+  characters). @@
+
+@@columns.html,tex,txt :: @eval list.Columns(K) eval@ @@