fix(jumpstart): name JumpStart in the content bucket error

`get_jumpstart_content_bucket` named Neo in its error for a region without a JumpStart entry. In v2 this message is the user-visible failure for `deepseek-llm-r1-distill-llama-8b` in `eusc-de-east-1` (#6242). Name JumpStart in the error.

The integration test loads the DeepSeek public metadata from `eusc-de-east-1` with an unsigned S3 client.

---
X-AI-Prompt: What is the minimal source change that fixes the EU Sovereign Cloud JumpStart error?
X-AI-Tool: claude-code

Author: evakravi

sagemaker-core/src/sagemaker/core/jumpstart/utils.py

@@ -11,6 +11,7 @@
 # ANY KIND, either express or implied. See the License for the specific
 # language governing permissions and limitations under the License.
 """This module contains utils for JumpStart."""
+
 from __future__ import absolute_import
 
 from typing import Optional
@@ -204,7 +205,7 @@ def get_jumpstart_content_bucket(
         except KeyError:
             formatted_launched_regions_str = get_jumpstart_launched_regions_message()
             raise ValueError(
-                f"Unable to get content bucket for Neo in {region} region. "
+                f"Unable to get content bucket for JumpStart in {region} region. "
                 f"{formatted_launched_regions_str}"
             )
 

sagemaker-core/tests/integ/jumpstart/test_bucket_utils.py

@@ -0,0 +1,47 @@
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"). You
+# may not use this file except in compliance with the License. A copy of
+# the License is located at
+#
+#     http://aws.amazon.com/apache2.0/
+#
+# or in the "license" file accompanying this file. This file is
+# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
+# ANY KIND, either express or implied. See the License for the specific
+# language governing permissions and limitations under the License.
+"""Regression tests for JumpStart metadata access in EU Sovereign Cloud."""
+
+from __future__ import absolute_import
+
+import boto3
+import pytest
+from botocore import UNSIGNED
+from botocore.config import Config
+
+from sagemaker.core.jumpstart.accessors import JumpStartModelsAccessor
+from sagemaker.core.jumpstart.utils import get_jumpstart_content_bucket
+
+EUSC_REGION = "eusc-de-east-1"
+EUSC_CONTENT_BUCKET = "jumpstart-cache-prod-eusc-de-east-1"
+DEEPSEEK_MODEL_ID = "deepseek-llm-r1-distill-llama-8b"
+
+
+@pytest.mark.serial
+def test_deepseek_public_metadata_loads_in_eusc():
+    s3_client = boto3.client(
+        "s3",
+        region_name=EUSC_REGION,
+        config=Config(signature_version=UNSIGNED),
+    )
+    JumpStartModelsAccessor.reset_cache({"s3_client": s3_client}, region=EUSC_REGION)
+
+    model_specs = JumpStartModelsAccessor.get_model_specs(
+        region=EUSC_REGION,
+        model_id=DEEPSEEK_MODEL_ID,
+        version="*",
+    )
+
+    assert get_jumpstart_content_bucket(region=EUSC_REGION) == EUSC_CONTENT_BUCKET
+    assert model_specs.model_id == DEEPSEEK_MODEL_ID
+    assert model_specs.get_speculative_decoding_s3_data_sources() == []

sagemaker-core/tests/unit/test_jumpstart_utils.py

@@ -491,7 +491,7 @@ def test_get_jumpstart_content_bucket_with_override(self):
     def test_get_jumpstart_content_bucket_invalid_region(self):
         """Test with invalid region"""
         with patch.object(constants, "JUMPSTART_REGION_NAME_TO_LAUNCHED_REGION_DICT", {}):
-            with pytest.raises(ValueError, match="Unable to get content bucket for Neo"):
+            with pytest.raises(ValueError, match="Unable to get content bucket for JumpStart"):
                 utils.get_jumpstart_content_bucket("invalid-region")
 
 
@@ -1572,7 +1572,9 @@ def test_add_instance_rate_stats_none_metrics(self):
         result = utils.add_instance_rate_stats_to_benchmark_metrics("us-west-2", None)
         assert result is None
 
-    @pytest.mark.skip(reason="Requires AWS Pricing API permissions which are not available in CI environment")
+    @pytest.mark.skip(
+        reason="Requires AWS Pricing API permissions which are not available in CI environment"
+    )
     @patch("sagemaker.core.common_utils.get_instance_rate_per_hour")
     def test_add_instance_rate_stats_success(self, mock_get_rate):
         """Test successfully adding instance rate stats"""