docs: add AGenUI v0.9 renderer to ecosystem

Author: niuma-zb

docs/ecosystem/renderers.md

@@ -20,6 +20,7 @@ Community and third-party A2UI renderer implementations.
 | **BBC6BAE9/a2ui-swift**                     | Apple (iOS, iPadOS, macOS, tvOS, watchOS, visionOS) | ✅   | ✅   | ![Stars](https://img.shields.io/github/stars/BBC6BAE9/a2ui-swift?style=flat-square&label=⭐) ![Last commit](https://img.shields.io/github/last-commit/BBC6BAE9/a2ui-swift?style=flat-square&label=updated)                                   | [GitHub](https://github.com/BBC6BAE9/a2ui-swift)                                                                                                       |
 | **TanXudong-Vivo/A2UI-Android-Renderer**    | Android (Jetpack Compose)                           | ❌   | ✅   | ![Stars](https://img.shields.io/github/stars/TanXudong-Vivo/A2UI-Android-Renderer?style=flat-square&label=⭐) ![Last commit](https://img.shields.io/github/last-commit/TanXudong-Vivo/A2UI-Android-Renderer?style=flat-square&label=updated) | [GitHub](https://github.com/TanXudong-Vivo/A2UI-Android-Renderer)                                                                                      |
 | **a2ui-vue**                                | Vue (Web)                                           | ✅   | ❌   | ![Stars](https://img.shields.io/github/stars/shawnwang15/a2ui-vue?style=flat-square&label=⭐) ![Last commit](https://img.shields.io/github/last-commit/shawnwang15/a2ui-vue?style=flat-square&label=updated)                                 | [GitHub](https://github.com/shawnwang15/a2ui-vue) · [npm](https://www.npmjs.com/package/a2ui-vue) · [Docs](https://shawnwang15.github.io/a2ui-vue/en/) |
+| **AGenUI/AGenUI** | iOS, Android, HarmonyOS | ❌ | ✅ | ![Stars](https://img.shields.io/github/stars/AGenUI/AGenUI?style=flat-square&label=⭐) ![Last commit](https://img.shields.io/github/last-commit/AGenUI/AGenUI?style=flat-square&label=updated) | [GitHub](https://github.com/AGenUI/AGenUI) · [Official Website](https://genui.amap.com/)|
 
 ### Notable Mentions
 
@@ -53,6 +54,8 @@ These projects are not directly A2UI renderers but are closely related and do su
 
 **TanXudong-Vivo/A2UI-Android-Renderer** is a modular Android renderer built with Jetpack Compose and Material 3, and is the first Android implementation to support the A2UI v0.9 protocol. It covers 13 fully implemented components (including Image loading via Coil), streaming rendering from LLM token streams, data binding with `path` expressions and `formatDate`, and a pluggable Custom Catalog for registering additional component types. The demo app includes a live connection to the official `restaurant_finder` ADK agent.
 
+**AGenUI/AGenUI** is the first cross-platform native renderer for A2UI v0.9, supporting iOS, Android, and HarmonyOS through a shared C++ core. It is designed for high performance, extensibility, and cross-platform consistency. AGenUI fully implements A2UI v0.9 and provides runtime APIs for extending UI components and function calls. It also introduces a [custom Catalog](https://github.com/AGenUI/AGenUI/blob/main/agenui_catalog.json) that extends the Basic Catalog with Table, Carousel, Web, RichText, and a Styles property for richer appearance and layout control, while staying aligned with A2UI’s extensible Catalog model. See the [component demo](https://genui.amap.com/components), the corresponding open-source [A2UI Generation Skill](https://github.com/AGenUI/AGenUI/tree/main/skills/a2ui-generation), and learn more on [GitHub](https://github.com/AGenUI/AGenUI).
+
 ## Submitting a Renderer
 
 If you have built an A2UI renderer, submit it to be listed here.