chore: refresh upstream indices

[github-actions]

Automated refresh of upstream indices under shared/references/.

• WordPress core versions (from api.wordpress.org)
• Gutenberg releases (from GitHub Releases API)
• WordPress/ai (canonical AI plugin) releases (from GitHub Releases API)
• WordPress ↔ Gutenberg mapping (from developer.wordpress.org docs)

If CI fails on this PR, the drift check caught a skill whose
declared canonical release now lags upstream — re-sync that skill
(see docs/upstream-sync.md) as a follow-up.

Summary by Sourcery

Enhancements:

• Update shared AI plugin release reference data from upstream sources.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR refreshes the upstream reference index for the canonical WordPress AI plugin releases, updating the local JSON reference to match current data from GitHub Releases and related upstream sources.

File-Level Changes

Change	Details	Files
Updated the canonical AI plugin releases reference index to reflect the latest upstream data.	Refreshed the list of WordPress/ai plugin releases based on the current GitHub Releases feed. Adjusted release metadata (versions, dates, tags, or URLs) where it diverged from upstream. Ensured the JSON structure remains consistent with existing reference index schema under shared/references/.	shared/references/ai-plugin-releases.json

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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