Add support for nested objects in plain arrays

[brianlmoon]

No description provided.

[Copilot]

Pull Request Overview

This PR adds support for serializing nested objects within plain arrays in both ValueObject and ArrayObject classes. The implementation recursively processes arrays to convert any nested Export or JsonSerializable objects to their array representations.

Key changes:

• Recursive array handling in toArray() methods to support nested object serialization
• Test coverage for nested objects in arrays
• Addition of missing ext-yaml dependency declaration

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/ValueObject.php	Adds recursive array processing to handle nested objects in array properties
src/ArrayObject.php	Adds recursive array processing to handle nested objects in array elements
tests/ValueObjectTest.php	Adds test case verifying ValueObject can serialize nested objects in arrays
tests/ArrayObjectTest.php	Adds test case for nested arrays with objects and modernizes @depends annotation to PHP 8+ attribute syntax
composer.json	Declares previously missing ext-yaml dependency required by existing YAML functionality

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