build: release v1.9.0

Author: outofcoffee

CHANGELOG.md

@@ -6,6 +6,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
+## [1.9.0] - 2026-05-28
+### Added
+- feat: add --id-file flag to up and down commands
+
+### Changed
+- ci: add downstream github action assurance gate
+
 ## [1.8.1] - 2026-05-28
 ### Fixed
 - fix: stop orphaned mock on healthcheck timeout (#129)