Shipped: K8s Stack Manager Extensions

Ready-to-deploy webhook extensions for K8s Stack Manager that add behaviour without forking the core. Event hooks: Slack and Teams notifications, a webhook relay, a maintenance gate and a Trivy security-scan gate that blocks deploys with critical CVEs. Actions: debug bundles, an Azure DevOps test runner and per-stack basic auth via Traefik. Each one ships with a Dockerfile, k8s manifests and a config snippet, and can be scoped per team. Any HTTP server that verifies the HMAC signature can be an extension. MIT licensed.