feat(baoyu-format-markdown): add markdown formatter skill

Formats plain text or markdown with frontmatter, titles, summaries,
headings, bold, lists, code blocks, and CJK typography fixes.

skills/baoyu-format-markdown/scripts/autocorrect.ts

@@ -0,0 +1,10 @@
+import { execSync } from "child_process";
+
+export function applyAutocorrect(filePath: string): boolean {
+  try {
+    execSync(`npx autocorrect-node --fix "${filePath}"`, { stdio: "inherit" });
+    return true;
+  } catch {
+    return false;
+  }
+}