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/document/heading.h

@@ -0,0 +1,41 @@
+#pragma once
+
+#include <string>
+#include <vector>
+#include <iostream>
+
+const std::string link_delimiter { "%" };
+
+class Heading {
+public:
+    Heading(int level, std::string filename, std::string section, std::string id,
+            std::string number, std::string title)
+        : m_level(level), m_filename(filename), m_section(section), m_id(id),
+          m_number(number), m_title(title)
+        {};
+    int m_level {};
+    std::string m_filename {};
+    std::string m_section {};
+    std::string m_id {};
+    std::string m_number {};
+    std::string m_title {};
+};
+
+std::ostream& operator<<(std::ostream& os, const Heading h);
+
+/*
+std::tuple<std::string, std::vector<Heading>, std::vector<unsigned int>, unsigned int>
+add_section_numbers(std::string s, std::string basename, std::vector<unsigned int> levels, unsigned int initial_id,
+                    std::map<std::string, std::string>& section_id_map);
+*/
+
+std::string make_html_table_of_contents(std::vector<Heading> headings);
+
+std::pair<int, std::string>
+make_navigation_table_of_contents(std::vector<Heading> headings);
+
+void show_table_of_contents(
+    std::string kt_filename, std::string title, std::vector<Heading> headings);
+
+std::string cache_table_of_contents(
+    std::string kt_root_filename, std::string title, std::vector<Heading> headings);