verify python codegen (#1278)

That's twice today that we missed regenerating the proto clients:

1. mid-PR on https://github.com/agent-substrate/substrate/pull/1276
(caught by code review)
2. https://github.com/agent-substrate/substrate/pull/1130 (missed and
still missing)

So this PR does:

1. regenerate with latest after #1130
2. ensure verify will catch this (so CI should fail if we haven't run
it), and that update will run it when developing

fixes https://github.com/agent-substrate/substrate/issues/738

- [x] Tests pass
- [x] Appropriate changes to documentation are included in the PR

hack/verify/python-codegen.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+# Copyright 2026 Google LLC
+#
+# 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.
+
+set -o errexit -o nounset -o pipefail
+
+ROOT="$(git rev-parse --show-toplevel)"
+cd "${ROOT}"
+
+./hack/third_party/kubernetes/verify-generated.sh python-codegen "$@"