feat: 对接 Agent MCP 能力

- 新增 runtime MCP 声明、ClientFactory、Toolkit 适配与工具别名映射

- 增加 MCP 环境检测与 stdio 环境变量透传

- 补齐 MCP 工具事件、审批与生命周期释放测试

easy-agents-agent-runtime/src/main/java/com/easyagents/agent/runtime/AgentDefinition.java

@@ -2,6 +2,7 @@ package com.easyagents.agent.runtime;
 
 import com.easyagents.agent.runtime.knowledge.AgentKnowledgeSpec;
 import com.easyagents.agent.runtime.memory.AgentMemoryPolicy;
+import com.easyagents.agent.runtime.mcp.McpSpec;
 import com.easyagents.agent.runtime.model.AgentGenerationOptions;
 import com.easyagents.agent.runtime.model.AgentModelSpec;
 import com.easyagents.agent.runtime.persistence.AgentPersistencePolicy;
@@ -28,6 +29,7 @@ public class AgentDefinition {
     private AgentGenerationOptions generationOptions = new AgentGenerationOptions();
     private AgentExecutionOptions executionOptions = new AgentExecutionOptions();
     private List<AgentToolSpec> toolSpecs = new ArrayList<>();
+    private List<McpSpec> mcpSpecs = new ArrayList<>();
     private List<AgentOperateToolSpec> operateToolSpecs = new ArrayList<>();
     private List<AgentKnowledgeSpec> knowledgeSpecs = new ArrayList<>();
     private AgentMemoryPolicy memoryPolicy = AgentMemoryPolicy.autoContext();
@@ -179,6 +181,24 @@ public class AgentDefinition {
         this.toolSpecs = toolSpecs == null ? new ArrayList<>() : new ArrayList<>(toolSpecs);
     }
 
+    /**
+     * 获取 MCP 声明。
+     *
+     * @return MCP 声明
+     */
+    public List<McpSpec> getMcpSpecs() {
+        return mcpSpecs;
+    }
+
+    /**
+     * 设置 MCP 声明。
+     *
+     * @param mcpSpecs MCP 声明
+     */
+    public void setMcpSpecs(List<McpSpec> mcpSpecs) {
+        this.mcpSpecs = mcpSpecs == null ? new ArrayList<>() : new ArrayList<>(mcpSpecs);
+    }
+
     /**
      * 获取操作类工具定义。
      *