Upgrade guide

[andrewdalpino]

No description provided.

[Copilot]

🟡 Changes recommended

The new upgrade guide includes copy-pastable PHP examples and statements that are currently inconsistent with the library API defaults/signatures.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Adds a dedicated upgrade guide to the documentation site to help users migrate from Rubix ML 2.0 to 3.0, and links it from the MkDocs navigation.

Changes:

• Added a new “Upgrading from 2.0 to 3.0” guide covering breaking changes, behavioral changes, and new features.
• Linked the new guide from the “Getting Started” section in mkdocs.yml.
• Removed a changelog bullet entry (“Emoji preset to Regex Filter”).

File summaries

File	Description
mkdocs.yml	Adds the Upgrade Guide page to the documentation navigation.
docs/upgrading-to-3.md	New upgrade guide content for migrating from 2.0 → 3.0.
CHANGELOG.md	Removes one bullet entry from the v3.0 changelog section.

Review details

Suppressed comments (1)

docs/upgrading-to-3.md:328

• Pipeline's constructor expects the first argument to be an array of transformers, but this example passes a single transformer instance, which would throw a TypeError if copied verbatim.

// or inside a pipeline
$estimator = new Pipeline(new FloatTypeConverter(), new KMeans(5));

• Files reviewed: 3/3 changed files
• Comments generated: 2
• Review effort level: Lite

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