Add changelog entry

Author: clementbiron

CHANGELOG.md

@@ -2,6 +2,15 @@
 
 All changes that impact users of this module are documented in this file, in the [Common Changelog](https://common-changelog.org) format with some additional specifications defined in the CONTRIBUTING file. This codebase adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased [major]
+
+> Development of this release was [supported](https://nlnet.nl/project/Modular-OTA/) by the [NGI0 Commons Fund](https://nlnet.nl/commonsfund/), a fund established by [NLnet](https://nlnet.nl/) with financial support from the European Commission's [Next Generation Internet](https://www.ngi.eu) programme, under the aegis of DG CNECT under grant agreement N°101069594.
+
+### Removed
+
+- Remove Notifier module
+- **Breaking:** Remove all default SMTP values (`host`, `port`, `username`) from logger configuration; operators enabling `sendMailOnError` must now explicitly set all three in `@opentermsarchive/engine.logger.smtp`
+
 ## 10.6.1 - 2026-02-05
 
 > Development of this release was supported by [Reset Tech](https://www.reset.tech).