Sites plugin (preview) adds in-app website and web-app creation and deployment

What this changes for operators

• An operator can now create, deploy, and manage websites, dashboards, and web apps directly within Codex, removing the external-tool step for web deployment.
• ChatGPT Business workspaces include Sites by default, so the operator decision is whether to allow/govern an in-product deploy surface that may already be enabled.
• Verification path: confirm whether Sites is enabled in your Business workspace and whether agent-initiated deployments fit your hosting/governance policy before relying on it.