chore: Add licensing and disclaimer section to README files.

README.md

@@ -817,3 +817,15 @@ This CLI is generated programmatically. Edits to generated files are overwritten
 - **Hand-written commands:** Add them under `internal/cli/custom/`; the scaffold is generated once and never overwritten.
 
 ### CLI Created by [Speakeasy](https://www.speakeasy.com/?utm_source=google-gemini/gemini-api-cli&utm_campaign=cli)
+
+## Licensing & Disclaimer
+
+Copyright 2026 Google LLC
+
+All software is licensed under the Apache License, Version 2.0 (Apache 2.0); you may not use this file except in compliance with the Apache 2.0 license. You may obtain a copy of the Apache 2.0 license at: https://www.apache.org/licenses/LICENSE-2.0
+
+All other materials are licensed under the Creative Commons Attribution 4.0 International License (CC-BY). You may obtain a copy of the CC-BY license at: https://creativecommons.org/licenses/by/4.0/legalcode
+
+Unless required by applicable law or agreed to in writing, all software and materials distributed here under the Apache 2.0 or CC-BY licenses are distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the licenses for the specific language governing permissions and limitations under those licenses.
+
+This is not an official Google product.