chore: release v2.1.0

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: magifd2

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/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [2.1.0] - 2026-05-23
 
 ### Added