Fix Gemini comments

Author: kabir

spec/src/main/java/io/a2a/spec/ExtendedCardNotConfiguredError.java

@@ -42,7 +42,7 @@ public ExtendedCardNotConfiguredError(
             Object data) {
         super(
                 defaultIfNull(code, EXTENDED_CARD_NOT_CONFIGURED_ERROR_CODE),
-                defaultIfNull(message, "Authenticated Extended Card not configured"),
+                defaultIfNull(message, "Extended Card not configured"),
                 data,
                 "https://a2a-protocol.org/errors/extended-agent-card-not-configured");
     }

spec/src/main/java/io/a2a/spec/ExtensionSupportRequiredError.java

@@ -1,6 +1,5 @@
 package io.a2a.spec;
 
-import static io.a2a.spec.A2AErrorCodes.EXTENDED_CARD_NOT_CONFIGURED_ERROR_CODE;
 import static io.a2a.spec.A2AErrorCodes.EXTENSION_SUPPORT_REQUIRED_ERROR;
 import static io.a2a.util.Utils.defaultIfNull;
 

spec/src/main/java/io/a2a/spec/VersionNotSupportedError.java

@@ -1,6 +1,5 @@
 package io.a2a.spec;
 
-import static io.a2a.spec.A2AErrorCodes.EXTENSION_SUPPORT_REQUIRED_ERROR;
 import static io.a2a.spec.A2AErrorCodes.VERSION_NOT_SUPPORTED_ERROR_CODE;
 import static io.a2a.util.Utils.defaultIfNull;
 

transport/jsonrpc/src/main/java/io/a2a/transport/jsonrpc/handler/JSONRPCHandler.java

@@ -249,7 +249,7 @@ public GetAuthenticatedExtendedCardResponse onGetAuthenticatedExtendedCardReques
             GetAuthenticatedExtendedCardRequest request, ServerCallContext context) {
         if (!agentCard.supportsExtendedAgentCard() || extendedAgentCard == null || !extendedAgentCard.isResolvable()) {
             return new GetAuthenticatedExtendedCardResponse(request.getId(),
-                    new ExtendedCardNotConfiguredError(null, "Authenticated Extended Card not configured", null));
+                    new ExtendedCardNotConfiguredError(null, "Extended Card not configured", null));
         }
         try {
             return new GetAuthenticatedExtendedCardResponse(request.getId(), extendedAgentCard.get());

transport/rest/src/main/java/io/a2a/transport/rest/handler/RestHandler.java

@@ -419,7 +419,7 @@ private int mapErrorToHttpStatus(A2AError error) {
     public HTTPRestResponse getExtendedAgentCard(String tenant) {
         try {
             if (!agentCard.supportsExtendedAgentCard() || extendedAgentCard == null || !extendedAgentCard.isResolvable()) {
-                throw new ExtendedCardNotConfiguredError(null, "Authenticated Extended Card not configured", null);
+                throw new ExtendedCardNotConfiguredError(null, "Extended Card not configured", null);
             }
             return new HTTPRestResponse(200, "application/json", JsonUtil.toJson(extendedAgentCard.get()));
         } catch (A2AError e) {