GA Agent Gateway docs

[susanharper-okta]

Description:

• What's changed? GA Agent Gateway docs
• Is this PR related to a Monolith release? yes 2026.9.1

Resolves:

• OKTA-1255104

Vercel Preview Link:

Agent Gateway concept: https://sdh-okta1255104-gaagentgateway--developer-docs.vercel.app/docs/concepts/agent-gateway/

Configure an AI agent for Agent Gateway: https://sdh-okta1255104-gaagentgateway--developer-docs.vercel.app/docs/guides/ai-configure-agent-for-gateway/main/

Configure an Agent Gateway: https://sdh-okta1255104-gaagentgateway--developer-docs.vercel.app/docs/guides/ai-configure-agent-gateway/main/

[okta-prod-github-app]

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Article	Total score Required:80	Word and phrases (Brand, terms) Preferred: 80	Correctness (Spelling, grammar) Preferred: 80	Clarity (Readability) Preferred: 80	Inclusive language (+ accesibility) Preferred: 80
✅ packages/@okta/vuepress-site/docs/concepts/agent-gateway/index.md	89	100	85	85
✅ packages/@okta/vuepress-site/docs/guides/ai-configure-agent-for-gateway/main/index.md	85	84	84	96
✅ packages/@okta/vuepress-site/docs/guides/ai-configure-agent-gateway/main/index.md	91	100	79	84

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