Two-tier filtering during article fetch: keyword/pattern rules as a fast
first pass, then optional LLM classification for borderline cases via
OpenRouter. Configurable sensitivity (strict/moderate/lenient), editable
keyword lists, blocked domain list, and admin stats display. Includes
30 unit tests covering domain blocking, title/body keywords, URL paths,
edge cases, and prompt structure.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Use $wpdb->prepare() with esc_like() in clear_article_cache()
- Add wp_http_validate_url() SSRF prevention in download_thumbnail()
- Add limit_response_size (5MB) on image downloads
- Set chmod 0644 after file_put_contents()
- Add transient-based concurrent fetch lock
