Update changelog

Author: weirdwater

packages/pluggable-widgets-tools/CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Changed
+
+-   We now enforce the same validation for the `widgetName` in the widget bundler as we do in the generator.
+
 ## [11.3.0] - 2025-11-12
 
 ### Changed