OKTA-1230265 - Anthropic Claude AI Agent import guide (redo)

[brentschaus-okta]

Reintroduces the guide from #6325, which was reverted in #6342 pending additional review.

No content changes yet — this is the same diff as #6325, rebuilt on current master. Follow-up commits will address review feedback before merge, including double-checking the "Claude Managed Agents" API details against Anthropic's current docs.

https://tbs-okta-1230265-anthropic-claude-ai-agent-im--developer-docs.vercel.app/docs/guides/ai-agent-import-claude/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/guides/ai-agent-import-claude/index.md	100	100	100	100
✅ packages/@okta/vuepress-site/docs/guides/ai-agent-import-claude/main/index.md	84	91	86	95

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