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/target/txt_util.py

@@ -101,7 +101,11 @@ def add_caption(element, caption_label, number, caption_text,
         caption = kutil.caption_marker("", caption_text, None)
     else:
         return element
-    caption = indent_text(re.sub(r"\s*\n\s*", " ", caption.strip()), indent)
+    # Marked laid-out, like the block: with no indent the caption begins
+    # with neither a space nor an nbsp, and the justification pass would
+    # re-flow it together with everything under it.
+    caption = phases.txt_verbatim_marker() + indent_text(
+        re.sub(r"\s*\n\s*", " ", caption.strip()), indent)
     if side in {"top", "left"}:
         return caption + "\n" + element
     return element + "\n" + caption