Keep real model benchmark validity checks active under optimization

tools/embeddinggemma2/test_benchmark_contract.py

@@ -0,0 +1,32 @@
+"""Benchmark validity checks must survive python -O."""
+import math
+import unittest
+from benchmark import Session, require, vectors
+
+
+class Contract(unittest.TestCase):
+    def test_bad_vectors_rejected(self):
+        for result in ([], [[1.0]], [[math.nan] * 768], [[0.0] * 768]):
+            with self.subTest(result_length=len(result)), self.assertRaises(ValueError):
+                vectors({"vectors": result}, 1)
+
+    def test_real_shape_normalized_vector_accepted(self):
+        vector = [1.0] + [0.0] * 767
+        self.assertEqual(vectors({"vectors": [vector]}, 1), [vector])
+
+    def test_cpu_contract_cannot_be_bypassed(self):
+        class FakeSession:
+            def send(self, value):
+                pass
+            def next(self):
+                return {"ok": True, "device": "gpu"}
+        with self.assertRaises(ValueError):
+            Session.worker(FakeSession(), {"op": "query"})
+
+    def test_explicit_guard_survives_optimization(self):
+        with self.assertRaises(ValueError):
+            require(False, "invalid asset")
+
+
+if __name__ == "__main__":
+    unittest.main()