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/document/js/help.js

@@ -0,0 +1,33 @@
+function modify_buttons_for_help(status) {
+    K.visible("#linkshow", status);
+    K.visible("#textshow", status);
+    K.visible("#searchtools", status);
+    K.get("#help").textContent = status == "show" ? "Help" : "Back";
+}
+
+function show_help() {
+    let header = K.get("#text h1");
+    if (header && header.textContent === "Navigation features") {
+        textshow();
+	modify_buttons_for_help("show");
+        frame_resize();
+    } else {
+        save_position();
+        K.get("#text").replaceWith(K.get("#help_page").cloneNode(true));
+        K.attr("#help_page", "id", "text");
+        K.visible("#toc", "hide");
+        K.visible("#resizer", "hide");
+        set_buttons("hide");
+        resize_text_width();
+	modify_buttons_for_help("hide");
+        frame_resize();
+    }
+}
+
+window.addEventListener("load", function (event) {
+    K.get("#help").addEventListener("click", function (e) {
+        event.preventDefault();
+        show_help();
+    });
+    define_keypress("H", "#help");
+});