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/code/sty/code.sty

@@ -0,0 +1,9 @@
+\usepackage{etoolbox}
+\usepackage{fancyvrb}
+
+\usepackage{listings}
+\lstset{basicstyle=\ttfamily,fontadjust=true,basewidth=0.5em,xleftmargin=26pt}
+
+\usepackage[strings,nohyphen]{underscore}
+
+\usepackage{mdframed}