>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3538881. --> Reported by: [d34dman](https://www.drupal.org/user/751698) >>> <ul> <li>Create a placeholder REST endpoint to: <ul> <li>Load an empty workflow state for initial testing.</li> <li>Persist node and edge structure on save.</li> </ul> </li> <li>Ensure CSRF token handling and permission checks for authenticated users.</li> <li>Test integration with <code>flowdrop_ui</code> to confirm frontend mounting.</li> </ul>