Initial commit: Klammertext source distribution

Curated source subset assembled by klammertext-dev's doc/make_dist.sh: the Klammermachine (mac), the Standard Klammer Set (sks), the commands (com), editor plugins and install guides (doc), a test subset (tst), and lib/bin placeholders. Builds with 'make -C com'.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

sks/target/latex_util.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <string>
+#include <vector>
+#include "font_resolve.h"
+
+namespace latex {
+
+std::string page(std::string structure,
+                 std::string title,
+                 std::string subtitle,
+                 std::string authors,
+                 std::string date,
+                 std::string version,
+                 std::string copyright,
+                 std::string bottom,
+                 std::string prolog,
+                 std::string paper_size,
+                 bool two_column,
+                 float leading,
+                 int pointsize,
+                 bool ragged_right,
+                 std::string cover,
+                 bool landscape,
+                 std::string body,
+                 Resolved_font serif_font = {},
+                 Resolved_font sans_font = {},
+                 Resolved_font mono_font = {},
+                 float font_scale = 1.0f);
+}
+
+void check_for_xelatex();
+std::vector<std::string> find_latex_error_lines(const std::string& log_content);