chore(release): prepare changelog for v0.16.6 (#1962)

Co-authored-by: kai-release-bot <action@github.com>
Signed-off-by: kai-release-bot <action@github.com>

Author: KaiPilotBot

.changes/unreleased/Fixed-20260721-174844.yaml

@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## [v0.16.6] - 2026-07-23
+
+### Fixed
+- Segmented PyTorch and LWS PodGrouper now uses minSubGroup on parent SubGroups, fixing admission webhook rejection. [#1927](https://github.com/kai-scheduler/KAI-Scheduler/issues/1927)
+
 ## [v0.16.5] - 2026-07-23
 
 ### Changed