fix(security): disable executable gray-matter frontmatter in commands

server/utils/frontmatter.js

@@ -0,0 +1,18 @@
+import matter from 'gray-matter';
+
+const disabledFrontmatterEngine = () => ({});
+
+const frontmatterOptions = {
+  language: 'yaml',
+  // Disable JS/JSON frontmatter parsing to avoid executable project content.
+  // Mirrors Gatsby's mitigation for gray-matter.
+  engines: {
+    js: disabledFrontmatterEngine,
+    javascript: disabledFrontmatterEngine,
+    json: disabledFrontmatterEngine
+  }
+};
+
+export function parseFrontmatter(content) {
+  return matter(content, frontmatterOptions);
+}