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Add "AI" section under Guides & References and its first sub-section "LLM Foundations & Prompting": AI landing page, how LLMs work (tokens, transformers, training, sampling, context, reasoning, mul...

Add "AI" section under Guides & References and its first sub-section "LLM Foundations & Prompting": AI landing page, how LLMs work (tokens, transformers, training, sampling, context, reasoning, multimodality, hallucination), prompt and context engineering, structured output, choosing models (benchmarks, cost/latency, open vs. closed), with MathJax, bibliography and a one-page cheat sheet PDF