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>

README.md

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+# Klammertext
+
+Klammertext is a markup language that produces multiple output formats —
+HTML, LaTeX/PDF, and plain text — from a single source description. Its core
+engine, the Klammermachine, is written in C++; the Standard Klammer Set (SKS)
+adds a default library of formatting and document-structuring operators on top.
+
+## Installing
+
+Installation guides are in [`doc/install/`](doc/install/):
+
+- Linux, from source — `doc/install/linux_source_install.md`
+- macOS, from source — `doc/install/macos_source_install.md`
+- Linux, container — `doc/install/linux_container_install.md`
+- macOS, container — `doc/install/macos_container_install.md`
+
+## Building from source
+
+With a C++20 compiler and `KLAMMERTEXT_HOME` set to this directory:
+
+    make -C com
+
+This builds the Klammermachine library (into `lib/`), the SKS components, and
+the three commands — `ktext`, `kdesc`, `kdiag` (into `bin/`). See the
+source-install guide for prerequisites (TeX Live for PDF output, Python, and so
+on).
+
+## Editor support
+
+Syntax highlighting and editing support for Emacs and Sublime Text are in
+[`doc/edit/`](doc/edit/).
+
+## License
+
+See [`LICENSE.md`](LICENSE.md).