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/section/section.k

@@ -2,56 +2,53 @@
 # the front and back matter of a book):
 
 @@preface.k :id :name Preface : Preface text @@
-@@preface.html,tex :: @eval section.Section(K, "preface") eval@ @@
+@@preface.html,tex,txt :: @eval section.Section(K, "preface") eval@ @@
 
 # Numbered section headings:
 
 @@part.k title :id :name Part : Part heading @@
-@@part.html,tex :: @eval section.Section(K, 0) eval@ @@
+@@part.html,tex,txt :: @eval section.Section(K, 0) eval@ @@
 
 @@s1.k title :id :n : Top level division, numbered  @@
-@@s1.html,tex :: @eval section.Section(K, 1) eval@ @@
-
-# Temporary hack for testing txt target; need to number section headings.
-@@s1.txt :: *title* @@
+@@s1.html,tex,txt :: @eval section.Section(K, 1) eval@ @@
 
 @@s2.k title :id :n : Second level division, numbered  @@
-@@s2.html,tex :: @eval section.Section(K, 2) eval@ @@
+@@s2.html,tex,txt :: @eval section.Section(K, 2) eval@ @@
 
 @@s3.k title :id :n : Third level division, numbered  @@
-@@s3.html,tex :: @eval section.Section(K, 3) eval@ @@
+@@s3.html,tex,txt :: @eval section.Section(K, 3) eval@ @@
 
 @@s4.k title :id :n : Fourth level division, numbered  @@
-@@s4.html,tex :: @eval section.Section(K, 4) eval@ @@
+@@s4.html,tex,txt :: @eval section.Section(K, 4) eval@ @@
 
 @@s5.k title :id :n : Fifth level division, numbered  @@
-@@s5.html,tex :: @eval section.Section(K, 5) eval@ @@
+@@s5.html,tex,txt :: @eval section.Section(K, 5) eval@ @@
 
 @@s6.k title :id :n : Sixth level division, numbered  @@
-@@s6.html,tex :: @eval section.Section(K, 6) eval@ @@
+@@s6.html,tex,txt :: @eval section.Section(K, 6) eval@ @@
 
 @@s7.k title :id :n : Seventh level division, numbered  @@
-@@s7.html,tex :: @eval section.Section(K, 7) eval@ @@
+@@s7.html,tex,txt :: @eval section.Section(K, 7) eval@ @@
 
 # Unnumbered section headings:
 
 @@h1.k title :id :n : Top level division, unnumbered @@
-@@h1.html,tex :: @eval section.Section(K, 1, numbered=False) eval@ @@
+@@h1.html,tex,txt :: @eval section.Section(K, 1, numbered=False) eval@ @@
 
 @@h2.k title :id : Second level division, unnumbered @@
-@@h2.html,tex :: @eval section.Section(K, 2, numbered=False) eval@ @@
+@@h2.html,tex,txt :: @eval section.Section(K, 2, numbered=False) eval@ @@
 
 @@h3.k title :id : Third level division, unnumbered @@
-@@h3.html,tex :: @eval section.Section(K, 3, numbered=False) eval@ @@
+@@h3.html,tex,txt :: @eval section.Section(K, 3, numbered=False) eval@ @@
 
 @@h4.k title :id    : Fourth level division, unnumbered @@
-@@h4.html,tex :: @eval section.Section(K, 4, numbered=False) eval@ @@
+@@h4.html,tex,txt :: @eval section.Section(K, 4, numbered=False) eval@ @@
 
 @@h5.k title :id    : Fifth level division, unnumbered @@
-@@h5.html,tex :: @eval section.Section(K, 5, numbered=False) eval@ @@
+@@h5.html,tex,txt :: @eval section.Section(K, 5, numbered=False) eval@ @@
 
 @@h6.k title :id    : Sixth level division, unnumbered @@
-@@h6.html,tex :: @eval section.Section(K, 6, numbered=False) eval@ @@
+@@h6.html,tex,txt :: @eval section.Section(K, 6, numbered=False) eval@ @@
 
 @@h7.k title :id    : Seventh level division, unnumbered @@
-@@h7.html,tex :: @eval section.Section(K, 7, numbered=False) eval@ @@
+@@h7.html,tex,txt :: @eval section.Section(K, 7, numbered=False) eval@ @@

sks/section/section.py

@@ -72,6 +72,5 @@ class Section(klammer_base.Klammer_base):
         result = f"%__sectionlink__{id}__{self.title}__" + "\n" + result
         return result
 
-# Need to implement the procedural numbering for the txt target
-#    def txt(self):
-#        return self.title
+    def txt(self):
+        return f"@b {self.title} @"