[test] Support value test infra

test/support/circle/README.md

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+# Circle value-test support
+
+This directory contains test-only infrastructure for checking numerical equivalence of
+Circle-to-Circle rewrites without `circle-interpreter` or `onert`.
+
+## Components
+
+- `builder.py` creates small, serializable `circle.ModelT` fixtures.
+- `evaluator.py` evaluates a deliberately limited operator subset with NumPy and records
+  every intermediate tensor value.
+- `value_test.py` provides reusable assertions for serialization round trips, pass
+  equivalence, graph-interface preservation, and extraction-boundary equivalence.
+
+The reference evaluator currently supports `ADD`, `SUB`, `MUL`, `RESHAPE`, and
+`TRANSPOSE`. Unsupported operators, fused activations, optional inputs, external
+buffers, and unsupported tensor types fail explicitly. The evaluator is not a
+production Circle runtime.
+
+Run the value tests with:
+
+```bash
+./ccex test -k circle.value
+```

test/support/circle/__init__.py

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+# Copyright (c) 2026 Samsung Electronics Co., Ltd. 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.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License 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.
+
+"""Support utilities for execution-based Circle value tests."""
+
+from test.support.circle.builder import CircleModelBuilder
+from test.support.circle.evaluator import (
+    circle_tensor_type_from_numpy_dtype,
+    CircleEvaluationResult,
+    CircleReferenceEvaluator,
+    numpy_dtype_from_circle_tensor_type,
+)
+from test.support.circle.value_test import (
+    CircleExtractionValueTestResult,
+    CirclePassValueTestResult,
+    CircleValueTestCase,
+    GraphInterfaceContract,
+    SignatureContract,
+    TensorContract,
+)
+
+__all__ = [
+    "CircleEvaluationResult",
+    "CircleExtractionValueTestResult",
+    "CircleModelBuilder",
+    "CirclePassValueTestResult",
+    "CircleReferenceEvaluator",
+    "CircleValueTestCase",
+    "GraphInterfaceContract",
+    "SignatureContract",
+    "TensorContract",
+    "circle_tensor_type_from_numpy_dtype",
+    "numpy_dtype_from_circle_tensor_type",
+]