chore(hub): add release notes for Hub UI v2.4.0

[henchaves]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request introduces the release notes for Hub UI version 2.4.0. The new version focuses on significant performance enhancements for large datasets, improved interactive features within the Playground, and a more robust groundedness evaluation pipeline. It also marks a complete transition to the modern v2 API for enhanced reliability and stability, alongside several key bug fixes.

Highlights

• Server-backed dataset management: Dataset test cases now load via a server-backed table, significantly improving performance for large datasets with filtering, sorting, pagination, and a bulk action preview.
• Enhanced Playground interactivity: The Playground now includes quick actions to remove the last conversation turn, re-generate assistant answers, and toggle between 'Pretty' and 'Raw' Markdown rendering, with display preferences saved.
• Advanced 3-step Groundedness pipeline: Groundedness evaluation has been upgraded to a multi-step pipeline that extracts evidence and re-checks borderline claims for higher accuracy, providing detailed, per-claim reasons in Markdown format.
• Improved task stability: Task management has been updated with stricter validation and more predictable behavior, ensuring tasks are linked to valid entities for reliable organizational workflows.
• Fixed large Knowledge Base uploads: The upload limit for Knowledge Base files has been increased to prevent failures for files larger than 10MB.
• Fixed evaluation log clarity: Internal warnings during evaluation are now suppressed to reduce noise in system logs, making it easier to identify and troubleshoot actual results.

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Changelog

• source/hub/ui/release_notes/2026-02-24.rst
  • Added release notes for Hub UI version 2.4.0, detailing new features and bug fixes.

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[gemini-code-assist]

Code Review

This pull request adds release notes for Hub UI v2.4.0. The content is clear and informative. I've left a suggestion to improve the wording and file formatting. However, there's a more significant issue: the new release note file source/hub/ui/release_notes/2026-02-24.rst is not linked in source/hub/release_notes.rst.inc. Without this change, the new release notes will not be visible on the main release notes page. Please update source/hub/release_notes.rst.inc to include a reference to this new file.

[gemini-code-assist]

A couple of suggestions for this line:

1. The phrase 'No changes yet' is a bit informal for release notes. To maintain a professional tone and avoid ambiguity, consider using a more standard phrase like 'No changes in this release'.
2. It's a good practice to end files with a single newline character. This prevents issues with some command-line tools and is a common convention.

Suggested change

	No changes yet.
	No changes in this release.