docs: prepare changelog for v0.8.0

Author: mkuritsu

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [v0.8.0] - 2025-08-15
 
 ### Added
 
@@ -424,3 +424,4 @@ Although they've moved on, their work is etched into the project's foundations.
 [v0.5.0]: https://github.com/GameDevTecnico/cubos/releases/tag/v0.5.0
 [v0.6.0]: https://github.com/GameDevTecnico/cubos/releases/tag/v0.6.0
 [v0.7.0]: https://github.com/GameDevTecnico/cubos/releases/tag/v0.7.0
+[v0.8.0]: https://github.com/GameDevTecnico/cubos/releases/tag/v0.8.0