Juan Leon updated code ownership structures in the ava-labs/avalanchego repository, focusing on testing-related directories to streamline the code review process. By leveraging YAML and DevOps practices, he assigned clear ownership for areas such as /.github, /scripts, and /tests, ensuring that reviews for testing code are handled efficiently and with greater accountability. This change improved traceability and auditability by linking ownership updates directly to specific commits and pull requests. While the work was limited in scope to code ownership alignment and did not involve new features or bug fixes, it addressed review delays and enhanced governance for testing workflows.