Migrate to custom oci registry

Signed-off-by: Bryan Frimin <bryan@probo.com>

contrib/claude/release/helm.md

@@ -0,0 +1,34 @@
+# Release Helm chart (`probo`)
+
+After confirming commits below, follow the
+[common steps](./README.md#3-common-steps-every-track).
+
+## Track facts
+
+- **Tag pattern**: `helm/v*`
+- **Version source**: `contrib/helm/charts/probo/Chart.yaml` (`version` field)
+- **Version bump**: Edit `version` in `contrib/helm/charts/probo/Chart.yaml`
+- **Changelog**: `contrib/helm/charts/probo/CHANGELOG.md`
+- **Files to stage**: `contrib/helm/charts/probo/Chart.yaml`,
+  `contrib/helm/charts/probo/CHANGELOG.md`
+- **Workflow**: `.github/workflows/release-helm.yaml`
+- **Path filter**: `contrib/helm`
+
+## Detect commits
+
+```shell
+git log $(git describe --tags --abbrev=0 --match='helm/v*')..HEAD --oneline \
+  -- contrib/helm
+```
+
+If empty or non-user-facing only, do not release this track.
+
+## Notes
+
+The chart has its own SemVer (`version`). `appVersion` in `Chart.yaml` is
+the default probod application version the chart deploys (image tag
+`v<appVersion>`). Bump `appVersion` when the chart should default
+to a newer probod release.
+
+CI packages the chart and pushes it to
+`oci://artifact.probo.inc/probo/probo`, then publishes a GitHub Release.