Fix #827

[DannyvdSluijs]

This PR will:

• Scan schemas that are being added for id properties and register them if valid schemas
• Avoid altering the id for sibling ref properties
• Don't register schema or expand refs when found in enum or const

This will fix #827

[Copilot]

Pull Request Overview

This PR addresses issue #827 by enhancing schema scanning and preventing unintended alterations to sibling ref properties. Key changes include:

• Updating function signatures with strict type hints and return types in both SchemaStorageInterface and SchemaStorage.
• Switching to strict equality (===) for schema id comparisons.
• Adding a recursive subschema registration method in SchemaStorage to scan for nested id properties.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/JsonSchema/SchemaStorageInterface.php	Updated function signatures with type hints and return types.
src/JsonSchema/SchemaStorage.php	Enhanced addSchema and expandRefs methods for better reference resolution and introduced subschema registration.
phpstan-baseline.neon	Adjusted baseline messages to reflect type validations and return type updates.
CHANGELOG.md	Updated changelog with new issue fix information.

Comments suppressed due to low confidence (1)

src/JsonSchema/SchemaStorage.php:105

• [nitpick] The variable names '$parentId' and '$childId' are used to manage schema reference resolution; adding a brief comment or using more descriptive names may improve clarity for future maintainers.

            if (property_exists($schema, 'id') && is_string($schema->id) && $childId !== $schema->id) {