add: trip planner with strands agents and vllm

[dwarez]

Note

Low Risk
Documentation-only addition (tutorial notebook); no production code, auth, or data-path changes.

Overview
Adds a new SageMaker tutorial notebook at docs/sagemaker/notebooks/sagemaker-sdk/trip-planner-agent-vllm/sagemaker-notebook.ipynb that walks through deploying Qwen/Qwen3-8B on SageMaker with the Hugging Face vLLM DLC and building a multi-turn trip-planning agent with Strands Agents.

The notebook covers ModelBuilder deployment (pinned vLLM image, CUDA 13 inference AMI), vLLM env vars for tool calling and Qwen3 reasoning, a direct chat-completions smoke test, mock tools (weather, currency, places), multi-turn agent demos, optional Hugging Face MCP tools, an optional Gradio streaming chat UI (with a public-share cost/security note), and endpoint cleanup.

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[HuggingFaceDocBuilderDev]

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[cursor]

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