chore: add preset-related tests to CHANGELOG

Signed-off-by: Jens Oliver Meiert <jens@meiert.com>

Author: j9t

CHANGELOG.md

@@ -13,6 +13,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
   - JSON is parsed and re-stringified to remove whitespace
   - Malformed JSON is logged and returned unchanged
 
+### Internal
+
+- Added preset-related tests
+
 ## [4.5.2] - 2025-11-28
 
 ### Internal