fix(baoyu-post-to-x): add entry point guard to md-to-html.ts for module import compatibility

Wrap main() in an import.meta.url check so that importing parseMarkdown
from x-article.ts no longer triggers the CLI entry point. Mirrors the
same fix applied to baoyu-post-to-weibo.

skills/baoyu-post-to-x/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: baoyu-post-to-x
 description: Posts content and articles to X (Twitter). Supports regular posts with images/videos and X Articles (long-form Markdown). Uses real Chrome with CDP to bypass anti-automation. Use when user asks to "post to X", "tweet", "publish to Twitter", or "share on X".
-version: 1.56.1
+version: 1.56.2
 metadata:
   openclaw:
     homepage: https://github.com/JimLiu/baoyu-skills#baoyu-post-to-x