Add Tag transformer for WP_Term objects

[pfefferle]

Proposed changes:

Adds a new Tag transformer class to handle WP_Term objects, converting them to ActivityPub OrderedCollection objects. This enables support for turning tags, categories, and custom taxonomies into federated collections in the Reader view.

• New Transformer: Tag class in includes/transformer/class-tag.php
• Factory Integration: Added WP_Term case to Factory::get_transformer()
• Tests: Comprehensive PHPUnit tests for Tag transformer and Factory integration

Other information:

• Have you written new tests for your changes, if applicable?

Testing instructions:

• Create a WP_Term (tag or category) in WordPress
• Use the Factory to get a transformer: Factory::get_transformer( $term )
• Verify it returns a Tag transformer instance
• Call to_object() and verify it returns an OrderedCollection
• Run the test suite: npm run env-test -- --filter=Test_Tag

Changelog entry

• Automatically create a changelog entry from the details below.

Changelog Entry Details

Significance

• Patch
• Minor
• Major

Type

• Added - for new features
• Changed - for changes in existing functionality
• Deprecated - for soon-to-be removed features
• Removed - for now removed features
• Fixed - for any bug fixes
• Security - in case of vulnerabilities

Message

Adds support for turning tags, categories, and custom taxonomies into federated collections in the Reader view so you can browse and follow topics more seamlessly.

[Copilot]

Pull request overview

This pull request adds support for transforming WordPress WP_Term objects into ActivityPub OrderedCollection objects. The implementation introduces a new Tag transformer class that handles taxonomy terms (tags, categories, and custom taxonomies) and integrates it into the existing transformer factory pattern.

Key Changes

• New Tag transformer class that converts WP_Term objects to ActivityPub OrderedCollection type
• Factory pattern integration to automatically route WP_Term objects to the Tag transformer
• Comprehensive test coverage for the new transformer and factory integration

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
includes/transformer/class-tag.php	New transformer class that converts WP_Term objects to OrderedCollection ActivityPub objects with term link as ID
includes/transformer/class-factory.php	Added WP_Term case to factory switch statement to instantiate Tag transformer
tests/phpunit/tests/includes/transformer/class-test-tag.php	New test file with comprehensive coverage for Tag transformer functionality across different taxonomies
tests/phpunit/tests/includes/transformer/class-test-factory.php	Added test case and setup for WP_Term factory integration

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