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/kutil/kutil.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <string>
+#include <vector>
+#include "machine.h"
+#include "file.h"
+
+inline
+std::vector<std::string> sks_basenames { // removed "book"
+    "kutil", "color", "document", "block", "font", "link", "section",
+    "list", "image", "table", "code", "target", "date" };
+
+const std::string caption_delimiter = "__CAPTION__";
+
+std::string read_file(std::string filename);
+
+std::string klammertext_dir();
+
+std::vector<std::string> old_sks_files_of_type(std::string extension);
+std::vector<std::string> sks_files_of_type(std::string extension, std::vector<std::string> subset={});
+
+std::string caption_marker(std::string name, std::string caption, std::string delimiter=" – ");
+
+std::string find_kt_file(std::string filename);
+
+std::string process(Machine& M, std::string target, std::string source_text,
+                    bool post_process=false, bool unescape_chars=false);
+
+std::string process(Machine& M, std::string target, fs::path source_filename,
+                    bool post_process=false, bool unescape_chars=false);
+
+std::string process(Machine& M, std::string target,
+                    std::string source_text, fs::path source_filename,
+                    bool post_process, bool unescape_chars);
+