Release/0.3.1

[jeffpaul]

What?

Prepares 0.3.1 release.

Closes #230.

Copilot summary

This pull request prepares the plugin for the 0.3.1 release by updating version numbers, changelogs, and documentation. The release focuses on improving reliability for image generation and enhancing developer documentation and contribution processes.

Release updates:

• Increased the image generation request timeout from 30s to 90s to reduce failed generations on slower providers/models. [1] [2]
• Updated version numbers to 0.3.1 in ai.php, includes/bootstrap.php, and readme.txt. [1] [2] [3]
• Added a new section to the changelog for version 0.3.1, including links to the comparison view between releases. [1] [2]

Developer documentation improvements:

• Added documentation on Experiment lifecycle and contribution criteria, and tidied up developer docs to clarify how experiments are added and can graduate from the plugin.
• Updated the Pull Request template to include an “AI tools usage” disclosure section, aligning with recent changes in WordPress core.

Why?

How?

Use of AI Tools

Testing Instructions

Testing Instructions for Keyboard

Screenshots or screencast

Before	After

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

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

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.69%. Comparing base (23d2039) to head (b9e3477).
⚠️ Report is 5 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #231   +/-   ##
==========================================
  Coverage      56.69%   56.69%           
  Complexity       505      505           
==========================================
  Files             32       32           
  Lines           2568     2568           
==========================================
  Hits            1456     1456           
  Misses          1112     1112           

Flag	Coverage Δ
unit	56.69% <ø> (ø)

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