Add human-in-the-loop guides for LangGraph and Vercel AI SDK

[GregHolmes]

Summary

• Adds two new HITL guides showing how to implement human-in-the-loop tool approval workflows using Ably channels for real-time communication between AI agents and human approvers
• Both guides demonstrate role-based authorization using JWT user claims
• Updates navigation and AI Transport landing page with links to the new guides

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch AIT-323-Guide-documentation-human-in-the-loop-Langraph-and-Vercel

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