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.cpp

@@ -0,0 +1,12 @@
+#include "argument.h"
+#include "argtype.h"
+
+Parameter::Parameter(const std::string& name, Argtype argtype, const Locator& loc,
+                   bool optional, std::string default_value)
+    : m_name(name)
+    , m_argtype(argtype)
+    , m_optional(optional)
+    , m_default(default_value)
+    , m_loc(loc)
+{
+}