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>

mac/command.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <string>
+//#include <filesystem>
+#include <vector>
+
+#include "file.h"
+
+void set_verbose_level(int argc, char* argv[]);
+bool show_usage(int argc, char* argv[]);
+
+fs::path construct_command_pathname(char* command);
+
+std::tuple<std::string, std::string, std::string, std::string, bool, bool>
+parse_args(
+    const std::vector<std::string>& input_filenames, std::string target,
+    std::string output_basename, bool display_only);