Fix WordPress 7.0 preview and test configs

[mehul0810]

What?

Closes #623

Updates the Playground, Plugin Check, PHPUnit, and wp-env configs now that WordPress 7.0 is available as the latest stable release.

Why?

The AI plugin requires WP 7.0, but some configs still contained temporary pre-release or trunk settings that were added before WP 7.0 was released.

This could cause the AI plugin Playground preview to load WP 7.0 RC5 instead of the final WP 7.0 release. Now that 7.0 is released, these configs can use stable release defaults again while keeping explicit trunk coverage where it is still useful.

How?

• Pins the WordPress.org Playground blueprint to WordPress 7.0.
• Pins the PR Playground preview blueprint to WordPress 7.0.
• Restores Plugin Check to run against latest.
• Restores the PHPUnit matrix to run against both latest and trunk.
• Restores .wp-env configs to core: null, which uses the latest production WordPress release.

Use of AI Tools

AI assistance: Yes
Tool(s): Codex
Model(s): GPT-5
Used for: Identifying the affected config files, preparing the local patch, and drafting validation steps. The changes were reviewed and confirmed by me.

Testing Instructions

• Confirm blueprint.json after running the blueprint on WP Playground

Screenshots or screencast

Not applicable. This is a configuration-only change.

Changelog Entry

Fixed - Playground and test configs now target the stable WordPress 7.0/latest release instead of temporary pre-release or trunk defaults where appropriate.

[github-actions]

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Co-authored-by: mehul0810 <mehul0810@git.wordpress.org>
Co-authored-by: dkotter <dkotter@git.wordpress.org>
Co-authored-by: jeffpaul <jeffpaul@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.45%. Comparing base (dcb1a90) to head (b09a37b).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #626      +/-   ##
=============================================
+ Coverage      74.00%   74.45%   +0.45%     
- Complexity      1738     1740       +2     
=============================================
  Files             85       85              
  Lines           7490     7521      +31     
=============================================
+ Hits            5543     5600      +57     
+ Misses          1947     1921      -26     

Flag	Coverage Δ
unit	74.45% <ø> (+0.45%)	⬆️

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[dkotter]

We shouldn't specify a version here as this will get out of date whenever a new version is released. I think we'd want latest

[dkotter]

Changed in b09a37b

[dkotter]

Similar to above, this should be latest I think

[dkotter]

Changed in b09a37b