docs: add NVIDIA Nemotron LLM guide

[alex-clawd]

Summary

• add a NVIDIA Nemotron section to the LLM provider docs
• document Nemotron 3 Ultra 550B A55B NVFP4 model details, hardware requirements, hosted NIM usage, and self-hosted OpenAI-compatible endpoint usage
• link to the NVIDIA Hugging Face model card

Testing

• git diff --check

Summary by CodeRabbit

• Documentation
  • Added comprehensive NVIDIA Nemotron 3 Ultra documentation covering model specifications, minimum GPU requirements, supported languages, and configuration guidance. Includes setup instructions for both hosted API endpoints and self-hosted OpenAI-compatible deployments with reasoning mode configuration.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 4f3d6444-8ad7-40ef-856d-f2c1c42ffae4

📥 Commits

Reviewing files that changed from the base of the PR and between 051fa0c and a7da8b9.

📒 Files selected for processing (1)

• docs/en/concepts/llms.mdx

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📝 Walkthrough

Walkthrough

A new documentation accordion section is added to the LLM concepts guide, documenting NVIDIA Nemotron 3 Ultra with specifications, two deployment option examples (hosted NVIDIA NIM and self-hosted OpenAI-compatible), supported languages, reasoning mode configuration, and LiteLLM integration notes.

Changes

NVIDIA Nemotron LLM Documentation

Layer / File(s)	Summary
NVIDIA Nemotron model documentation docs/en/concepts/llms.mdx	Accordion section added describing Nemotron 3 Ultra model architecture and context length, minimum GPU serving requirements, hosted NIM setup with API key and LiteLLM dependency, self-hosted OpenAI-compatible endpoint configuration with base_url and api_key, model details table, supported languages, enable_thinking reasoning mode flag via chat template, and model card link.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A rabbit hops through docs so bright,
Nemotron now shines in full light,
With models, with modes, and setup so clear,
The path to great reasoning now appears near! 🚀

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding documentation for NVIDIA Nemotron as an LLM guide, which aligns perfectly with the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch alex/docs-nvidia-nemotron-llm

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