chore: add changelog entry for #1165

Author: brendan-kellam

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- [EE] Added three new audit actions covering the full org membership lifecycle: `org.member_added` (fires from all five `UserToOrg`-creation paths, including two that were previously silent), `org.member_removed`, and `org.member_left`. [#1165](https://github.com/sourcebot-dev/sourcebot/pull/1165)
+
 ## [4.17.0] - 2026-04-30
 
 ### Added