fix(http): preserve SessionEvent discriminants

Author: kkkhs

crates/rmcp/src/transport/streamable_http_server/session/local.rs

@@ -884,9 +884,6 @@ pub enum SessionEvent {
         id: HttpRequestId,
         responder: oneshot::Sender<Result<(), SessionError>>,
     },
-    CancelRequestWiseChannel {
-        id: HttpRequestId,
-    },
     Resume {
         last_event_id: EventId,
         responder: oneshot::Sender<Result<StreamableHttpMessageReceiver, SessionError>>,
@@ -906,6 +903,9 @@ pub enum SessionEvent {
     EstablishCommonChannel {
         responder: oneshot::Sender<Result<StreamableHttpMessageReceiver, SessionError>>,
     },
+    CancelRequestWiseChannel {
+        id: HttpRequestId,
+    },
 }
 
 #[derive(Debug, Clone)]