Add NVFP4 + QAD to the Nemotron-3-Nano-30B-A3B tutorial

[kevalmorabia97]

What does this PR do?

Type of change: documentation

Note: This is part 3 of 4 (depends on #1589 and #1600 for the tutorial commands to actually run):

• Part 1 (Add Megatron-Bridge PTQ quantize + export example scripts #1589): Megatron-Bridge quantize.py + export.py.
• Part 2 (Add Quantization Aware Distillation (QAD) to Megatron-Bridge example #1600): distill.py Quantization Aware Distillation (QAD).
• Part 3 (this PR): add the NVFP4 + QAD experiments to the Nemotron-3-Nano-30B-A3B tutorial (docs only).
• Part 4: repeat the NVFP4 + QAD experiments on a non-Nemotron model.

This PR targets main directly (the changes are docs-only and don't touch Part 1/2 code), but the new tutorial commands use examples/megatron_bridge/{quantize,export,distill}.py and so require #1589 + #1600 to be merged before they run.

Updates the Nemotron-3-Nano-30B-A3B-BF16 tutorial:

• Adds an NVFP4 PTQ → QAD → export section (recovering the NVFP4 accuracy drop), and migrates the existing FP8 section to the examples/megatron_bridge quantize.py / export.py scripts.
• Adds placeholder rows for the NVFP4 / NVFP4+QAD accuracy numbers and the NVFP4 vLLM throughput number (? — filled in once the experiments land).
• Wraps all tutorial commands in collapsible <details> blocks.
• Reframes the tutorial as NVFP4 + QAD (instead of FP8) in the root README "Latest News", CHANGELOG.rst, and the examples/pruning / minitron_vs_puzzletron references.

Draft: kept as a draft until the NVFP4 + QAD experiment numbers are available to replace the ? placeholders.

Testing

Docs-only change; rendered Markdown / collapsible blocks verified and markdownlint + RST hooks pass.

Before your PR is "Ready for review"

• Is this change backward compatible?: N/A (docs only)
• If you copied code from any other sources or added a new PIP dependency, did you follow guidance in CONTRIBUTING.md: N/A
• Did you write any new necessary tests?: N/A (docs only)
• Did you update Changelog?: ✅
• Did you get Claude approval on this PR?: ❌ (will run /claude review)

Additional Information

Placeholder ? cells in the tutorial's Results tables (NVFP4 / NVFP4+QAD accuracy, NVFP4 vLLM throughput) will be filled in with the experiment results before this leaves draft.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.43%. Comparing base (72df833) to head (d8817a6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1601   +/-   ##
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  Coverage   77.43%   77.43%           
=======================================
  Files         480      480           
  Lines       52564    52564           
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+ Hits        40703    40704    +1     
+ Misses      11861    11860    -1     

Flag	Coverage Δ
unit	53.72% <ø> (+<0.01%)	⬆️

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