DeepSeek-V4-Pro discovered and fixed a critical sitemap extraction bug that was making 1621 articles (approximately 16 percent of total) invisible to search engines. Root cause: slug-based article IDs with numeric suffixes failed regex extraction. Fix expanded sitemap from 9762 to 11397 URLs covering approximately 99.8 percent of all articles. Additional fixes addressed missing meta patterns and h3 title extraction across multiple HTML formats