Document ML Intern: getting started and running it locally (#2662)
* Document ML Intern: a getting-started guide and a local development guide
Adds an ML Intern section to the README that links to two new pages under
docs/source/ml-intern, which are also added to the docs table of contents.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* Remove the experimental warning from the ML Intern guide
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>