The ansi target, txt table styles, kdesc reference from ref/, typeface and table-width fixes (from dev fcec5e2e77ac)

Since the previous release: Machine::read_string() (the fs::path/std::string
overload pair split); kdesc -c and -u rendered from the ref/ reflection
klammerset; a fit column's tex width measured in TeX over every entry;
@typeface resolving to the family its css declares (a store directory name
now works in html) and hieroglyphs in @unicode_examples set in their
typeface; the ansi target -- plain text with the type styles a terminal can
show, identical to txt once the escape sequences are stripped -- with the
txt @table carrying :header_style, :style and :hline; @block anchoring,
@table spacing and the Image_quality state variable; and the rewritten
doc/klammertext_for_llm.md.

tst/kdesc_test.sh

@@ -169,7 +169,7 @@ shows  "34. without -i the klammerset is shown" '@table'   "$KDESC" -k
 DERIVE=$(mktemp /tmp/kdesc_derive.XXXXXX.k)
 printf '@@wave.k s : Wave @@\n@@wave :: @i *s* @ @@\n' > "$DERIVE"
 shows  "35. coverage is derived through the unlisted klammerset" \
-       '@wave +html pdf tex txt +from @i' "$KDESC" -i "$DERIVE" --coverage
+       '@wave +ansi html pdf tex txt +from @i' "$KDESC" -i "$DERIVE" --coverage
 absent "36. ... and the klammerset is not reported" '@table' "$KDESC" -i "$DERIVE" --coverage
 # A klammer the input REDEFINES came from the klammerset, but the input
 # changed it -- which is exactly what a reader needs to know.