docs: prepare changelog for v0.15.0 (#1605)

Signed-off-by: Erez Freiberger <enoodle@gmail.com>

Author: enoodle

CHANGELOG.md

@@ -6,6 +6,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
 
+### Added
+
+### Changed
+
+### Fixed
+
+## [v0.15.0] - 2026-05-20
+
 ### Added
 - Added `enabled` Helm values for `binder`, `podgrouper`, `podgroupcontroller`, `queuecontroller`, `admission`, and `scheduler` to allow disabling individual components from values.yaml. Previously these were hardcoded to `true` in the kai-config template.
 - Added `prometheus.enabled` and `prometheus.externalPrometheusUrl` Helm values to configure Prometheus from values.yaml [#907](https://github.com/NVIDIA/KAI-Scheduler/issues/907)