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/src/services/yaml.mjs

@@ -0,0 +1,46 @@
+// Minimal YAML emitter for action results (objects, arrays, scalars).
+// Output only; parsing is done by the vendored yaml package (see source.mjs).
+
+const PLAIN = /^[A-Za-z0-9_./@+-][A-Za-z0-9_ ./@+:-]*$/;
+const RESERVED = /^(true|false|null|yes|no|on|off|~|-?\d+(\.\d+)?)$/i;
+
+function scalar(value) {
+  if (value === null || value === undefined) return 'null';
+  if (typeof value === 'boolean' || typeof value === 'number') return String(value);
+  const text = String(value);
+  if (text === '' || !PLAIN.test(text) || RESERVED.test(text) || text.endsWith(':') || text.includes(': ') || text.includes(' #')) {
+    return JSON.stringify(text);
+  }
+  return text;
+}
+
+function isEmpty(value) {
+  return (Array.isArray(value) && value.length === 0) || (value && typeof value === 'object' && Object.keys(value).length === 0);
+}
+
+function emit(value, indent) {
+  const pad = ' '.repeat(indent);
+  if (Array.isArray(value)) {
+    return value
+      .map((item) => {
+        if (item && typeof item === 'object' && !isEmpty(item)) {
+          const body = emit(item, indent + 2);
+          return `${pad}- ${body.slice(indent + 2)}`;
+        }
+        return `${pad}- ${isEmpty(item) ? (Array.isArray(item) ? '[]' : '{}') : scalar(item)}`;
+      })
+      .join('\n');
+  }
+  return Object.entries(value)
+    .filter(([, item]) => item !== undefined)
+    .map(([key, item]) => {
+      if (item && typeof item === 'object' && !isEmpty(item)) return `${pad}${key}:\n${emit(item, indent + 2)}`;
+      if (isEmpty(item)) return `${pad}${key}: ${Array.isArray(item) ? '[]' : '{}'}`;
+      return `${pad}${key}: ${scalar(item)}`;
+    })
+    .join('\n');
+}
+
+export function toYaml(value) {
+  return `${emit(value, 0)}\n`;
+}