prepare release 0.12.0; svgdx 0.25.0, mdbook 0.5.1

Author: codedstructure

CHANGELOG.md

@@ -7,6 +7,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.12.0 2025-11-22]
+
+- Changed: updated to svgdx 0.25.0
+- Update to mdbook 0.5
+
 ## [0.11.0 2025-10-19]
 
 - Changed: updated to svgdx 0.24.0