fix(skills): document xurl X Article ingestion

skills/social-media/xurl/SKILL.md

@@ -192,6 +192,15 @@ xurl search "from:elonmusk" -n 20
 xurl search "#buildinpublic lang:en" -n 15
 ```
 
+For X Articles, use raw API mode instead of the `read` shortcut. `xurl read`
+expects a post ID or post URL; do not put `read` before a `/2/tweets/...`
+endpoint. Request the `article` tweet field and ingest `data.article.plain_text`
+from the JSON response:
+
+```bash
+xurl --app APP_NAME '/2/tweets/2057909493250539891?expansions=author_id,attachments.media_keys,referenced_tweets.id&tweet.fields=created_at,lang,public_metrics,context_annotations,entities,possibly_sensitive,conversation_id,in_reply_to_user_id,referenced_tweets,article'
+```
+
 ### Users, Timeline, Mentions
 
 ```bash