chore: update CHANGELOG for v0.4.2 [skip ci]

Author: github-actions[bot]

CHANGELOG.md

@@ -6,6 +6,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ---
+## [v0.4.2] - 2026-03-09
+
+## What's Changed
+
+### ♻️ Refactoring
+- refactor: remove all Claude references — this is a GitHub Copilot blueprint
+
+
 ## [v0.4.1] - 2026-03-09
 
 ## What's Changed