docs: Update changelog for v0.7.1

Author: taj54

CHANGELOG.md

@@ -6,6 +6,7 @@ All notable changes for each version of the Ambient Music extension.
 
 ## v0.7.1 2025 08 24
 
+- refactor: Encapsulate Git operations in a GitService
 - refactor: Extract version calculation to a separate utility
 - refactor: Introduce UpdaterService for dependency injection
 - feat: Introduce custom error types for granular error handling