Out-of-process rebuild: Add Plugin/McpServer.h/.cpp — routes MCP tools through HelperConnection

Source/Plugin/McpServer.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <thread>
+#include <atomic>
+#include <string>
+#include <memory>
+
+namespace httplib { class Server; }
+class HelperConnection;
+
+class McpServer
+{
+public:
+    McpServer(int port, HelperConnection& helper);
+    ~McpServer();
+
+    void start();
+    void stop();
+    bool isRunning() const;
+    int getPort() const { return port; }
+
+private:
+    void setupRoutes();
+
+    std::string handleInitialize(const std::string& requestBody);
+    std::string handleToolsList(const std::string& requestBody);
+    std::string handleToolsCall(const std::string& requestBody);
+
+    std::unique_ptr<httplib::Server> server;
+    std::thread serverThread;
+    std::atomic<bool> running{false};
+    int port;
+    std::string sessionId;
+    bool initialized = false;
+
+    HelperConnection& helper;
+};