Update langchain_deep_research documentation to mention Anthropic API key is needed

[yczhang-nv]

Description

Closes nvbugs-5801706

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Summary by CodeRabbit

• Documentation
  • Added an "API Keys" subsection to Getting Started:
    • NVIDIA Build API Key required for Section 3.0 (configurable LLMs)
    • Tavily API Key required for web search features
    • Anthropic API Key optional; Section 2.0 can be skipped and you may start at Section 3.0 if unavailable

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[coderabbitai]

Walkthrough

Updated README for the langchain_deep_research example by adding an "API Keys" subsection under Getting Started that lists required and optional API keys: NVIDIA Build API Key (required for Section 3.0+), Tavily API Key (required for web search), and Anthropic API Key (optional, only for Section 2.0).

Changes

Cohort / File(s)	Summary
Documentation examples/frameworks/auto_wrapper/langchain_deep_research/README.md	Added an "API Keys" subsection under Getting Started specifying NVIDIA Build API Key (required for Section 3.0+), Tavily API Key (required for web search), and Anthropic API Key (optional; only for Section 2.0).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is related to the main change but exceeds the recommended 72-character limit at 85 characters, and is somewhat verbose when it could be more concise.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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📥 Commits

Reviewing files that changed from the base of the PR and between 488ee82 and 35eb764.

📒 Files selected for processing (1)

• examples/frameworks/auto_wrapper/langchain_deep_research/README.md

🚧 Files skipped from review as they are similar to previous changes (1)

• examples/frameworks/auto_wrapper/langchain_deep_research/README.md

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[mnajafian-nv]

LGTM!

[yczhang-nv]

/merge