fix: tolerate gateways without image profiles

tests/test_payload.py

@@ -121,6 +121,24 @@ class CodexRetryGatewayTUITests(unittest.TestCase):
         self.assertEqual(mod.request_updated_elapsed(row), "1.0s")
         self.assertEqual(mod.request_chunk_progress(row), "7 / 4.1KB")
 
+    def test_optional_image_profiles_endpoint_can_be_absent_on_older_gateway(self) -> None:
+        mod = load_module()
+        missing_endpoint = mod.urllib.error.HTTPError(
+            "http://127.0.0.1:4610/__codex_retry_gateway/api/image-profiles",
+            404,
+            "Not Found",
+            {},
+            None,
+        )
+        with mock.patch.object(mod, "fetch_payload", side_effect=missing_endpoint):
+            payload, error = mod.fetch_optional_payload(
+                "http://127.0.0.1:4610/__codex_retry_gateway/api/image-profiles",
+                5,
+                allow_not_found=True,
+            )
+        self.assertEqual(payload, {})
+        self.assertEqual(error, "")
+
     def test_request_usage_summary_shows_cached_ratio(self) -> None:
         mod = load_module()
         row = {