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/argument.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include "argtype.h"
+
+// The Parameter class describes both parameters (in definitions) and
+// arguments (in applications). Parameters are the primary concept:
+// a designer declares parameters, and a writer supplies arguments to
+// fill them. The class is named for the definition side because
+// definitions come first; the Argument alias is used at application sites.
+class Parameter
+{
+public:
+    Parameter()
+        : m_name("_default")
+        , m_argtype(Argtype())
+        , m_optional(false)
+        , m_default("")
+        , m_loc()
+        , m_target()
+        {};
+
+    Parameter(const std::string& name, Argtype argtype, const Locator& loc,
+             bool optional=false, std::string default_value = "");
+    ~Parameter() = default;
+
+    std::string python_value(std::string value);
+    bool undefined() const { return m_name == "_default"; };
+
+    std::string m_name {};
+    Argtype m_argtype; // {};
+    bool m_optional {};
+    std::string m_default {};
+    Locator m_loc;
+    std::string m_target {};
+};
+
+using Argument = Parameter;