Wires up automatic Helm chart releases to ride along with the existing
changeset-driven package release flow.
Today `Chart.yaml` is bumped by hand and `release-helm.yml` fires only
when a human pushes a `helm-v*` tag. With this, the changeset release PR
also carries a `Chart.yaml` bump so main always matches the published
version, and `release.yml` invokes `release-helm.yml` via
`workflow_call` after Docker images are published.
`helm-v${VERSION}` tag is pushed as a marker (same GITHUB_TOKEN trick as
`v.docker.*`). Manual `helm-v*` tag flow still works. Chart.yaml
consistency check in `release-helm.yml` is the safety net if the bump
job ever drifts.
First rollout: the open `changeset-release/main` PR has stale
Chart.yaml. Bump it manually on that branch before merging, otherwise
the first automated helm release fails at the consistency check.
nicktrn
3446be7b32