docs: mark adapter-agentx as completed in roadmap

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: deepracticexc

README.md

@@ -326,7 +326,7 @@ UIX provides AI-readable design rules that work with any AI coding tool. No npm
 - [x] A2UI protocol adapter (`@uix-ai/adapter-a2ui`, experimental)
 
 ### Phase 3: Ecosystem Integration (current)
-- [ ] AgentX adapter (`@uix-ai/adapter-agentx`)
+- [x] AgentX adapter (`@uix-ai/adapter-agentx`)
 - [ ] assistant-ui integration guide
 - [ ] IR validation CLI tool
 - [ ] Live demo with real AI agent

README.zh-CN.md

@@ -326,7 +326,7 @@ UIX 提供 AI 可读的设计规则（Skills），适用于任何 AI 编程工
 - [x] A2UI 协议适配器（`@uix-ai/adapter-a2ui`，实验性）
 
 ### 第三阶段：生态集成（进行中）
-- [ ] AgentX 适配器（`@uix-ai/adapter-agentx`）
+- [x] AgentX 适配器（`@uix-ai/adapter-agentx`）
 - [ ] assistant-ui 集成指南
 - [ ] IR 校验 CLI 工具
 - [ ] 接入真实 AI Agent 的 Live Demo