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/target/target.k

@@ -38,7 +38,7 @@ of this: neither the transforms nor the quoting reach it.
 
 @@@state Target_txt_indent
   :desc Width of indentation in the plain text target (txt)
-  :value 3
+  :value 2
 @@@
 
 # The txt target is not fully implemented in the SKS yet.
@@ -59,7 +59,7 @@ of this: neither the transforms nor the quoting reach it.
   --- -- |
   ``  "  |
   ''  "  |
-  `   `  |
+  `   '  |
   '   '  |
   ~   __KTEXTNBSP__
   :after_apply