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/block/css/block.css

@@ -0,0 +1,26 @@
+
+p {
+    margin: .5rem 0 .5rem 0;
+}
+
+.quote {
+    margin-left: 2em;
+}
+
+.box {
+    border: solid black 1px;
+    padding: 0.5em 1em;
+    clear: both;
+    margin: 1.0em 0;
+    overflow: auto;
+}
+
+.centered {
+    margin-left: auto;
+    margin-right: auto;
+    width: fit-content;
+}
+
+.indent {
+    margin-left: 2rem;
+}