fix: handle MCP notifications properly (notifications/initialized)

- Add handle_notification() for notification messages (no id field)
- Use CARGO_PKG_VERSION for dynamic version in initialize response
- Skip serializing None fields in McpResponse and McpError
- Remove verified field from setup info

src/main.rs

@@ -40,8 +40,11 @@ pub struct McpRequest {
 #[derive(Debug, serde::Deserialize, serde::Serialize)]
 pub struct McpResponse {
     jsonrpc: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
     id: Option<Value>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     result: Option<Value>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     error: Option<McpError>,
 }
 
@@ -49,6 +52,7 @@ pub struct McpResponse {
 pub struct McpError {
     code: i32,
     message: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
     data: Option<Value>,
 }
 
@@ -113,6 +117,11 @@ async fn run_stdio_server() -> Result<()> {
                 let server_clone = server.clone();
                 match serde_json::from_str::<McpRequest>(line) {
                     Ok(request) => {
+                        // Notifications have no id — don't send a response
+                        if request.id.is_none() {
+                            server_clone.handle_notification(request).await;
+                            continue;
+                        }
                         let response = server_clone.handle_request(request).await;
                         let response_json = serde_json::to_string(&response)?;
                         println!("{}", response_json);
@@ -182,6 +191,10 @@ async fn handle_connection(socket: tokio::net::TcpStream) -> Result<()> {
                 
                 match serde_json::from_str::<McpRequest>(line) {
                     Ok(request) => {
+                        if request.id.is_none() {
+                            server.handle_notification(request).await;
+                            continue;
+                        }
                         let response = server.handle_request(request).await;
                         let response_json = serde_json::to_string(&response)? + "\n";
                         writer.write_all(response_json.as_bytes()).await?;

src/mcp_server.rs

@@ -99,6 +99,18 @@ impl McpServer {
         }
     }
 
+    /// Handle a notification (no id — no response sent)
+    pub async fn handle_notification(&self, request: McpRequest) {
+        match request.method.as_str() {
+            "notifications/initialized" => {
+                // Client confirms initialization is complete — no action needed
+            }
+            _ => {
+                tracing::debug!("Unhandled notification: {}", request.method);
+            }
+        }
+    }
+
     pub async fn handle_request(&self, request: McpRequest) -> McpResponse {
         match request.method.as_str() {
             "initialize" => {
@@ -123,9 +135,8 @@ impl McpServer {
                 // Return immediately with fast status
                 let server_info = json!({
                     "name": "MT5-Quant",
-                    "version": "1.27.0",
+                    "version": env!("CARGO_PKG_VERSION"),
                     "setup": {
-                        "verified": null,  // null = checking
                         "hint": "Auto-verification running... Use verify_setup tool for detailed status",
                     }
                 });