2026 Feature Update 1

[mdekstrand]

This is the first feature update of the 2026 release series. Details are in the release notes. Highlights:

• New pipeline tooling for expanding a configuration file into a full configuration (lenskit pipeline expand) and generating a Mermaid diagram for a pipeline (lenskit pipeline diagram).
• Restored Pandas 2.2 support for better Google Colab compatibility.
• Fixed a few small bugs.
• Better progress and cancellation for Rust-accelerated training tasks.

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This discussion was created from the release 2026 Feature Update 1.