@zendritic this is settled now. The chart moved into the CIQ org, and it lives in the operator repository itself rather than in one of its own, so ctrliq/ascender-operator is the official home of both.
helm repo add ascender-operator https://ctrliq.github.io/ascender-operator/
helm repo update
helm search repo ascender-operator
helm install -n ascender --create-namespace my-ascender-operator ascender-operator/ascender-operator
The chart is named ascender-operator, and its version and appVersion both track the operator release, so the chart version is the operator version you are installing.
Every release packages the chart, attaches the tarball to its GitHub release, and refreshes the index served from the gh-pages branch, which is what the repository URL above points at. Releases from 25.6.1 on carry a chart, and older ones predate the workflow, so helm search repo lists only the versions that have one.
The install page is helm-install-on-existing-cluster, and the values are documented in .helm/starter/README.md, which is also where the chart is generated from.