Umbriel — upstream attribution

Umbriel builds on surreal_orm, originally created by Oyelowo Oyedayo.
Upstream project: https://github.com/Oyelowo/surreal_orm

Copyright (c) 2023 Oyelowo Oyedayo
Copyright (c) 2024 Oyelowo Oyedayo

This file consolidates the attribution and copyright notices previously
included in source-file headers. It acknowledges the original work on which
Umbriel is based; it does not grant a new license or change any existing
rights or licensing terms applicable to that work.