Add archify-vscode-ext skill: Archify diagrams and models for the Archify Diagram Viewer extension

Model tasks (validate, list, scaffold, resolve), diagram tasks (validate,
render), the bundled Archify 3.0.1 runtime and yaml parser under
scripts/vendor, references for authoring, formats and folders, and the
online-shop example model.

scripts/vendor/yaml/schema/common/string.js

@@ -0,0 +1,14 @@
+import { stringifyString } from '../../stringify/stringifyString.js';
+
+const string = {
+    identify: value => typeof value === 'string',
+    default: true,
+    tag: 'tag:yaml.org,2002:str',
+    resolve: str => str,
+    stringify(item, ctx, onComment, onChompKeep) {
+        ctx = Object.assign({ actualString: true }, ctx);
+        return stringifyString(item, ctx, onComment, onChompKeep);
+    }
+};
+
+export { string };