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.

sks/document/document_class.cpp

@@ -276,9 +276,12 @@ void Document_class::collect_typefaces(const std::string& text)
             // located error naming the available typefaces if the store
             // does not have it, which is the whole error path for a
             // misspelled or uninstalled typeface.
+            // Compared by directory name: a @typeface may write either
+            // the family name or the store's directory name, and both
+            // resolve to the same directory.
             bool seen = false;
             for (const auto& rf : m_resolved_extra)
-                if (rf.family_name == name) seen = true;
+                if (rf.dir_name == name_to_dirname(name)) seen = true;
             if (!seen) {
                 // What a @typeface klammer asked for, and what the store
                 // resolved it to: a decision the user cannot read off
@@ -293,13 +296,22 @@ void Document_class::collect_typefaces(const std::string& text)
     }
 }
 
-std::string Document_class::strip_typeface_markers(const std::string& text)
+const Resolved_font& Document_class::resolved_typeface(const std::string& name) const
+{
+    for (const auto& rf : m_resolved_extra)
+        if (rf.dir_name == name_to_dirname(name)) return rf;
+    // collect_typefaces() resolves every marker before this is asked.
+    throw Internal_error("Typeface \"" + name + "\" was not resolved");
+}
+
+std::string Document_class::resolve_typeface_families(const std::string& text)
 {
     std::string result {};
     size_t pos = 0, start = 0, end = 0;
     std::string name {}, scale {};
     while (next_typeface_marker(text, pos, start, end, name, scale)) {
         result += text.substr(pos, start - pos);
+        result += resolved_typeface(name).family_name;
         pos = end;
     }
     result += text.substr(pos);