Release/0.6.0

[jeffpaul]

What?

Prepares 0.6.0 release.

Closes #319.

Copilot summary

This pull request prepares the plugin for the 0.6.0 release by introducing new image editing experiments, refactoring and standardizing feature organization, updating documentation, and handling the upgrade routine for the new version. It also updates contributor credits and ensures all new and changed code is properly versioned.

New features and experiments:

• Added prompt-based image editing experiments in the Post Editor and Media Library, including background expansion/removal and item replacement/removal.
• Expanded "Image Generation" to "Image Generation and Editing" in documentation and user-facing descriptions.

Refactoring and standardization:

• Refactored Experiments to be a type of Feature, standardized plugin constants to WPAI_*, and renamed hook prefixes for improved code organization and naming consistency.
• Standardized versioning and documentation tags throughout the codebase to 0.6.0, replacing placeholders like x.x.x. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23]

Upgrade routine and migrations:

• Refactored the upgrade routine and added v0.6.0 migrations to ensure smooth transition to the new version. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14]

Documentation and UI improvements:

• Updated documentation, removed stray "AI" references from UI, and improved discoverability of the Generate Alt Text button. [1] [2]
• Updated contributor credits in CREDITS.md to include new contributors.

Version bump:

• Bumped plugin version to 0.6.0 in ai.php and throughout the codebase. [1] [2]

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.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

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

❌ Patch coverage is 23.07692% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.85%. Comparing base (b0fdee8) to head (6d55cbe).
⚠️ Report is 9 commits behind head on develop.

Files with missing lines	Patch %	Lines
includes/Deprecated.php	0.00%	9 Missing ⚠️
includes/Features/Loader.php	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #327   +/-   ##
==========================================
  Coverage      57.85%   57.85%           
  Complexity       615      615           
==========================================
  Files             46       46           
  Lines           3165     3165           
==========================================
  Hits            1831     1831           
  Misses          1334     1334           

Flag	Coverage Δ
unit	57.85% <23.07%> (ø)

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