Fix actor isolation in timeout wrapper - add missing await keywords

Author: dcherrera

Sources/MCP/Client/Client.swift

@@ -336,7 +336,7 @@ public actor Client {
                     Task {
                         NSLog("🔵 CLIENT.send() - Task started, adding pending request")
                         // Add the pending request before attempting to send
-                        self.addPendingRequest(
+                        await self.addPendingRequest(
                             id: request.id,
                             continuation: continuation,
                             type: M.Result.self
@@ -353,7 +353,7 @@ public actor Client {
                             // If send fails, try to remove the pending request.
                             // Resume with the send error only if we successfully removed the request,
                             // indicating the response handler hasn't processed it yet.
-                            if self.removePendingRequest(id: request.id) != nil {
+                            if await self.removePendingRequest(id: request.id) != nil {
                                 continuation.resume(throwing: error)
                             }
                             // Otherwise, the request was already removed by the response handler
@@ -378,7 +378,7 @@ public actor Client {
                 return result
             } catch {
                 // Clean up pending request on timeout
-                _ = self.removePendingRequest(id: request.id)
+                _ = await self.removePendingRequest(id: request.id)
                 throw error
             }
         }