feat: 标准化 Agent AG-UI 与审批运行时

- 新增 AG-UI 事件投影与协议编码模块

- 支持 Turn 级审批作用域和受信任动态审批策略

easy-agents-agui/src/test/java/com/easyagents/agui/AguiProtocolEventEncoderTest.java

@@ -0,0 +1,43 @@
+package com.easyagents.agui;
+
+import io.agentscope.core.agui.event.AguiEvent;
+import io.agentscope.core.agui.model.AguiMessage;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.List;
+
+/**
+ * {@link AguiProtocolEventEncoder} 的线级协议测试。
+ */
+public class AguiProtocolEventEncoderTest {
+
+    private final AguiProtocolEventEncoder encoder = new AguiProtocolEventEncoder();
+
+    /**
+     * 验证 AgentScope 官方事件保留 AG-UI type 字段。
+     */
+    @Test
+    public void shouldEncodeOfficialEvent() {
+        String json = encoder.encodeToJson(new AguiEvent.RunStarted("thread-1", "run-1"));
+
+        Assert.assertTrue(json.contains("\"type\":\"RUN_STARTED\""));
+        Assert.assertTrue(json.contains("\"threadId\":\"thread-1\""));
+    }
+
+    /**
+     * 验证补充的失败和消息快照事件使用现代 AG-UI 标准事件名。
+     */
+    @Test
+    public void shouldEncodeExtendedStandardEvents() {
+        String error = encoder.encodeToJson(
+                new AguiExtendedEvent.RunError("thread-1", "run-1", "boom", "FAILED"));
+        String snapshot = encoder.encodeToJson(new AguiExtendedEvent.MessagesSnapshot(
+                "thread-1", "run-1", List.of(AguiMessage.userMessage("message-1", "hello"))));
+
+        Assert.assertTrue(error.contains("\"type\":\"RUN_ERROR\""));
+        Assert.assertTrue(error.contains("\"code\":\"FAILED\""));
+        Assert.assertTrue(snapshot.contains("\"type\":\"MESSAGES_SNAPSHOT\""));
+        Assert.assertTrue(snapshot.contains("\"role\":\"user\""));
+    }
+}