Add e2e test infrastructure and implementations for AI Transport guides

[GregHolmes]

Introduce guides/ai-transport/ directory with full runnable code for all 8 AI Transport guides (4 providers x 2 streaming patterns), each with publisher, subscriber, and e2e tests hitting real LLM APIs and Ably.

• OpenAI, Anthropic, Vercel AI SDK, and LangGraph providers
• Message-per-token and message-per-response streaming patterns
• 24 e2e tests total (3 per guide): lifecycle ordering, response reconstruction, and token concatenation verification
• Yarn workspaces with shared Vitest config
• Exclude guides/ from root Jest config

[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-489-Introduce-E2E-testing-for-Guides-code

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