docs: add pullfrog AI review overview to README

Author: spivanatalie64

README.md

@@ -120,4 +120,14 @@ Together we'll make X great again!
 [XLibre Discussions at GitHub](https://github.com/orgs/X11Libre/discussions) | [XLibre mailing list at FreeLists](https://www.freelists.org/list/xlibre) | [@x11dev channel at Telegram](https://t.me/x11dev) | [#xlibre room at Matrix](https://matrix.to/#/#xlibre:matrix.org) | [XLibre security contact at GitHub](https://github.com/X11Libre/xserver/security/policy)
 
 [Interview: Meet Enrico Weigelt, the maintainer of the new XLibre fork - Felipe Contreras](https://felipec.wordpress.com/2025/06/11/enrico-weigelt/)
+---
 
+## 🤖 Pullfrog AI Review
+
+This repository uses **Pullfrog AI** to automatically review pull requests.
+
+Pullfrog is an AI-powered code review agent that analyzes every PR for code quality,
+security issues, performance problems, and best practice violations. Reviews appear
+as inline PR comments and checks. Trigger manually by commenting `@pullfrog` on any PR.
+
+Powered by OpenRouter.