Release/1.2.0

[jeffpaul]

This pull request releases version 1.2.0 of the AI Provider for Google plugin, introducing new features, compatibility updates, and several bug fixes. The most important changes are summarized below.

New features:

• Added support for text-to-speech conversion via the new GoogleTextToSpeechConversionModel class. This enables generating WAV audio files from text using Gemini, including handling raw PCM audio and wrapping it in a usable format.
• Introduced a WordPress Playground preview blueprint to streamline testing and demonstration of the plugin, including automatic installation, activation, and configuration for provider requests.

Compatibility and testing:

• Updated the supported baseline to PHP AI Client 1.3.1 and added automated compatibility testing across PHP 7.4–8.4 with both the lowest and latest supported dependencies.

Bug fixes and improvements:

• Fixed Google thought signature round-tripping and improved thought token usage compatibility for tool-calling requests, ensuring function calls remain valid in multi-step Gemini conversations. [1] [2] [3]
• Improved Gemini usage parsing to use Google’s authoritative totalTokenCount when available, with a backward-compatible fallback for older responses. [1] [2] [3] [4]

Documentation and versioning:

• Updated version numbers and changelog entries throughout the codebase and documentation to reflect the 1.2.0 release. [1] [2] [3] [4] [5]

These changes collectively improve the plugin's feature set, reliability, and compatibility with the latest PHP and WordPress AI Client releases.

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

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[saarnilauri]

Should be fixed in this PR before merging:

1. tests/ and phpunit.xml.dist will ship to WordPress.org and to Composer consumers.

Both files were added in #40, after 1.1.1. So 1.2.0 is the first release that would carry them. Neither .distignore nor .gitattributes excludes them.

2. readme.txt Features list doesn't mention text-to-speech.

TTS (#31) is the headline feature of this release, but the Description section still reads "text generation, image generation, and other AI capabilities" with a bullet list of Text generation / Image generation / Function calling / Automatic provider registration. Users browsing the WP.org listing won't see the new capability. It's only in the changelog. Worth adding a * Text to speech conversion with Gemini bullet and touching the intro sentence.