fix: replay recorded walks with selected identity backend

recognization/code/test_eval_live.py

@@ -237,5 +237,41 @@ class CliTests(unittest.TestCase):
             load_index(root)
 
 
+class IdentityContractTests(unittest.TestCase):
+    def test_missing_gallery_weights_exit_without_a_matcher_score(self):
+        root = tempfile.mkdtemp()
+        self.addCleanup(shutil.rmtree, root, ignore_errors=True)
+        recording = os.path.join(root, "session")
+        os.makedirs(recording)
+        write_jpeg(os.path.join(recording, "000000.jpg"), np.zeros((8, 8, 3), dtype=np.uint8))
+        with open(os.path.join(recording, "index.jsonl"), "w", encoding="utf-8") as handle:
+            handle.write(json.dumps({"frame": 1, "path": "000000.jpg", "tracks": []}) + "\n")
+        missing = os.path.join(root, "no-such-dinov2.safetensors")
+        report_path = os.path.join(recording, "eval_live.json")
+        env = os.environ.copy()
+        env["DORAYAKI_DINOV2_WEIGHTS"] = missing
+        completed = subprocess.run(
+            [
+                sys.executable,
+                os.path.join(current_dir, "eval_live.py"),
+                recording,
+                "--replay",
+                "--identity",
+                "gallery",
+                "--json",
+                report_path,
+            ],
+            capture_output=True,
+            text=True,
+            check=False,
+            env=env,
+        )
+        self.assertEqual(completed.returncode, 2)
+        payload = json.loads(completed.stdout)
+        self.assertIn("DINOv2", payload["error"])
+        self.assertIn("matcher", payload["error"])
+        self.assertFalse(os.path.exists(report_path))
+        self.assertNotIn("accepted_rate", completed.stdout)
+
 if __name__ == "__main__":
     unittest.main()