Restore AWS GovCloud Support via Bedrock Mantle

Question

### What variant of Codex are you using?

CLI

### What feature would you like to see?

AWS GovCloud support for the Codex CLI was added on May 21 here:
https://github.com/openai/codex/pull/23860

and then reverted here on May 27:
https://github.com/openai/codex/pull/24690

Since these PRs, [AWS rolled out GPT-5.4 in GovCloud (us-gov-west-1)](https://aws.amazon.com/about-aws/whats-new/2026/06/GPT54-available-in-aws-govcloud-us-west/) earlier this month. Given this change, **Can GovCloud support

Restore AWS GovCloud Support via Bedrock Mantle

What variant of Codex are you using?

What feature would you like to see?

Additional information