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/klammer_set.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "klammer.h"
+#include "target_set.h"
+
+class Klammer_set
+{
+public:
+    Klammer_set() = default;
+    void add(Argtype_set argtypes, Target_set& targets,
+             std::vector<Katom>::iterator begin, std::vector<Katom>::iterator end, std::vector<Katom>& katoms);
+    void rationalize(Target_set targets);
+    void check_klammer(std::string name, std::string target, Locator loc);
+    const std::vector<Katom>* constant_body(const std::string& name) const;
+    std::string instance_list(int margin) const;
+    std::string describe(int margin=0) const;
+
+    std::map<std::string, Klammer> m_klammers {};
+};