fix(rest): format history length query parameter

This fixes #1197

Author: 014-code

client/transport/rest/src/main/java/org/a2aproject/sdk/client/transport/rest/RestTransport.java

@@ -141,7 +141,7 @@ public Task getTask(TaskQueryParams taskQueryParams, @Nullable ClientCallContext
         try {
             StringBuilder url = new StringBuilder(Utils.buildBaseUrl(agentInterface, taskQueryParams.tenant()));
             if (taskQueryParams.historyLength() != null && taskQueryParams.historyLength() > 0) {
-                url.append(String.format("/tasks/%1s?historyLength=%2d", taskQueryParams.id(), taskQueryParams.historyLength()));
+                url.append(String.format("/tasks/%s?historyLength=%d", taskQueryParams.id(), taskQueryParams.historyLength()));
             } else {
                 url.append(String.format("/tasks/%1s", taskQueryParams.id()));
             }

client/transport/rest/src/test/java/org/a2aproject/sdk/client/transport/rest/RestTransportTest.java

@@ -189,14 +189,15 @@ public void testGetTask() throws Exception {
                 request()
                         .withMethod("GET")
                         .withPath("/tasks/de38c76d-d54c-436c-8b9f-4c2703648d64")
+                        .withQueryStringParameter("historyLength", "5")
         )
                 .respond(
                         response()
                                 .withStatusCode(200)
                                 .withBody(GET_TASK_TEST_RESPONSE)
                 );
         ClientCallContext context = null;
-        TaskQueryParams request = new TaskQueryParams("de38c76d-d54c-436c-8b9f-4c2703648d64", 10);
+        TaskQueryParams request = new TaskQueryParams("de38c76d-d54c-436c-8b9f-4c2703648d64", 5);
         RestTransport instance = new RestTransport(CARD);
         Task task = instance.getTask(request, context);
         assertEquals("de38c76d-d54c-436c-8b9f-4c2703648d64", task.id());