katom types from ref/ in groups, @table :leading in lines of text and :rulesep, @code under txt, one table style attribute, literal-klammer options (from dev 2e453744f5e9)

kdesc --katoms is Klammertext rendered from ref/, the types in titled groups,
with --katoms full for the regex column.  @table :leading L is L lines of the
surrounding text in html as in pdf (default 1), and :rulesep spaces the
horizontal rules.  The html table has one style attribute, so :column_width
fractions take effect again.  @code and @source_listing render in plain
text; captions are numbered per kind there, and a table needs no blank line
around it.  @c takes :nd, and an option-shaped word before a bar inside
literal code is code.

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

sks/code/code.k

@@ -13,15 +13,16 @@ katom when no bar is written, "^@code :filename f :pattern p" DISPLAYED THOSE
 WORDS as the listing rather than acting on them.
 @@
 
-@@code.html,tex :: @eval code_block.Code(K) @ @@
+@@code.html,tex,txt :: @eval code_block.Code(K) @ @@
 
-@@c.k code_text.literal :
+@@c.k :nd.bool | code_text.literal :
 A word or phrase displayed verbatim in a line.  Like ^@code, its content is
 LITERAL -- nothing in it is interpreted as Klammertext -- so it must be closed
 with the named delimiter "c^@".  ^@c is the in-line form and ^@code the block
 form of the same thing; before 2026-08-16 this parameter was an ordinary
 string, so a "^#" or a bare "^@" inside it was read as Klammertext and usually
 failed the file, which is not what "verbatim" can mean.
+If :nd (no delimiters) is true, then the txt target delimiters are excluded.
 @@
 
 @@c.html,tex,txt :: @eval code_block.Code_fragment(K) eval@
@@ -44,4 +45,4 @@ quietly different listing.
 
 Named "^@source_file" until 2026-08-16.  # retired-ok
 @@
-@@source_listing.html,tex :: @eval :cwd *K_input_dir* code_block.Source(K) @ @@
+@@source_listing.html,tex,txt :: @eval :cwd *K_input_dir* code_block.Source(K) @ @@