fix(serve): repair HuggingFace -> JumpStart redirect in ModelBuilder

Two bugs prevented `ModelBuilder(model="<HF_id_with_JS_mirror>").build()`
from working with any bare HuggingFace id (gpt2, Qwen/Qwen3-0.6B,
microsoft/phi-2, etc.), reproducible end-to-end:

  ModelBuilder.build()
    -> _build_single_modelbuilder              (model_builder.py:2579)
    -> _use_jumpstart_equivalent               (model_builder_utils.py)
    -> _hf_schema_builder_init                 raises TaskNotFoundException
    -> redirect aborts before HF -> JS id swap

1. `sagemaker/serve/schema/task.json` was missing from the published
   wheel. setuptools needs an explicit `[tool.setuptools.package-data]`
   declaration; `include-package-data = true` alone is a no-op without a
   MANIFEST.in or version-controlled file list. Without the JSON in the
   wheel, `retrieve_local_schemas("text-generation")` raised
   FileNotFoundError, the caller wrapped it in TaskNotFoundException, and
   the redirect aborted before swapping to the JumpStart id.

2. `_use_jumpstart_equivalent` called `_build_for_jumpstart()` itself,
   then `_build_single_modelbuilder` called it again on return. The
   second call hit `_prepare_for_mode` with consumed state and raised
   FileNotFoundError. Removed the inner call; the caller already handles
   it.

Also wraps the HF schema bootstrap in a try/except so a missing local
task or flaky remote schema fetch can't abort the redirect — the
JumpStart build path supplies its own schema downstream.

Verified end-to-end: ModelBuilder(model="gpt2").build() and
ModelBuilder(model="Qwen/Qwen3-0.6B").build() both succeed (model
created with TGI / DJL_SERVING respectively). Pure-boto3 control with
the same JumpStart djl-inference image + S3 artifacts was already
accepted by CreateModel/CreateEndpointConfig/CreateEndpoint, so the
AWS contract and JumpStart artifacts were never the issue.

Author: ZealSV

sagemaker-serve/pyproject.toml

@@ -61,6 +61,9 @@ where = ["src"]
 include = ["sagemaker*"]
 namespaces = true
 
+[tool.setuptools.package-data]
+"sagemaker.serve" = ["schema/*.json"]
+
 [tool.setuptools.dynamic]
 version = { file = "VERSION"}
 

sagemaker-serve/src/sagemaker/serve/model_builder_utils.py

@@ -942,17 +942,20 @@ def _use_jumpstart_equivalent(self) -> bool:
                 if not model_task:
                     model_task = hf_model_md.get("pipeline_tag")
                 if model_task:
-                    self._hf_schema_builder_init(model_task)
+                    try:
+                        self._hf_schema_builder_init(model_task)
+                    except TaskNotFoundException:
+                        logger.warning(
+                            "HF schema builder unavailable for task %r; "
+                            "JumpStart build path will supply its own schema.",
+                            model_task,
+                        )
 
             huggingface_model_id = self.model
             jumpstart_model_id = self._jumpstart_mapping[huggingface_model_id]["jumpstart-model-id"]
             self.model = jumpstart_model_id
             merged_date = self._jumpstart_mapping[huggingface_model_id].get("merged-at")
 
-            # Call _build_for_jumpstart if method exists
-            if hasattr(self, "_build_for_jumpstart"):
-                self._build_for_jumpstart()
-
             compare_model_diff_message = (
                 "If you want to identify the differences between the two, "
                 "please use model_uris.retrieve() to retrieve the model "