- Added Event Subscriber to intercept entity presave events and synchronize moderation states.
- Implemented  to handle moderation state changes for books and their children.
- Updated  to define the Event Subscriber service.
- Added functional tests to verify moderation state synchronization.
- Updated  with detailed documentation and installation instructions.
- Ensured compatibility with Drupal 10 and 11 by adding core_version_requirement.
- Added  to define module dependencies.
- Configured  for automated testing.
- Added  to specify GPLv2 licensing.

This release focuses on ensuring that moderation states are correctly synchronized between books and their child nodes, providing a seamless editorial experience.