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>

doc/install/klammertext.zsh

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+# Klammertext via Apple's `container` — macOS (Apple Silicon) shell wrapper
+# -----------------------------------------------------------------------------
+# Lets you run Klammertext without typing the full `container run ...` command.
+# Install: save this file (e.g. ~/klammertext.zsh) and add to your ~/.zshrc:
+#
+#     source ~/klammertext.zsh
+#
+# Then open a new terminal and use `ktext`, `kdesc`, `kdiag` like normal
+# commands.  Requires Apple Silicon + macOS 26 or later, with Apple's
+# `container` runtime installed and its service started (`container system
+# start`).  Install `container` from the signed .pkg at
+# https://github.com/apple/container/releases (NOT Homebrew).  See
+# doc/install/macos_container_install.md for the full guide.
+# -----------------------------------------------------------------------------
+
+# The published image is multi-arch; on Apple Silicon `container` pulls the
+# native arm64 build, so no --platform / --rosetta is needed.
+KLAMMERTEXT_IMAGE="${KLAMMERTEXT_IMAGE:-akopra/klammertext:latest}"
+
+_klammertext_run() {
+  local cmd="$1"; shift
+  container run --rm \
+    -v "$PWD:/work" -w /work \
+    "$KLAMMERTEXT_IMAGE" "$cmd" "$@"
+}
+
+# The three Klammertext commands. Files are read from and written to the
+# current directory (mounted into the container as /work).
+ktext() { _klammertext_run ktext "$@"; }
+kdesc() { _klammertext_run kdesc "$@"; }
+kdiag() { _klammertext_run kdiag "$@"; }
+
+# Download or update to the latest published image (delete first so the moving
+# `latest` tag is definitely refreshed).
+klammertext-update() {
+  container image delete "$KLAMMERTEXT_IMAGE" 2>/dev/null
+  container image pull "$KLAMMERTEXT_IMAGE"
+}