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**User Management Improvements:** * The `UserManagement` class now loads existing users from the user database during initialization, ensuring that the in-memory user list reflects the database state through the abstraction boundary. * The `IUserDatabase` interface now exposes `GetUsers()`, returning `UserManagementDataType` records instead of only user names. * `UserManagement.LoadUsersFromDatabase()` now consumes `IUserDatabase.GetUsers()` so custom user database implementations can provide persisted user metadata such as `UserConfiguration` and `Description`. * `LinqUserDatabase` implements `GetUsers()` and returns user records with the stored user name and default user-management metadata. `JsonUserDatabase` inherits this behavior through `LinqUserDatabase`. **Address Space Management:** * The server now properly removes the UserManagement node from the address space when user management is not enabled, preventing stale or orphaned nodes. **Test Coverage Enhancements:** * Added tests to verify that the UserManagement node is removed when user management is not present. * Added tests to confirm that `LinqUserDatabase.GetUsers()` returns the correct users. * Added tests to confirm that `UserManagement` starts with all users from the database, including custom `IUserDatabase` implementations that return full `UserManagementDataType` metadata. These changes keep user discovery on the `IUserDatabase` abstraction, remove the concrete-type dependency from startup, and allow existing users to be loaded with their associated management metadata.