update the changelog

Author: Alexander Pann

CHANGELOG.md

@@ -5,6 +5,16 @@ All notable changes to this project are documented in this file.
 Format of the log is _loosely_ based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 The project does _not_ follow Semantic Versioning and the changes are documented in reverse chronological order, grouped by calendar month.
 
+## Dezember 2025
+
+### Added
+
+- All intentions can now be customized (description, is applicable block, child filter, execute block) through the extension point `IntentionCustomization`.
+
+### Improved
+
+- Some intention descriptions were improved.
+
 ## November 2025
 
 ### Added