`harmony-fleet-release --from-tag harmony-fleet-operator-v0.1.0` builds +
pushes the operator image and helm chart at the parsed version
(version_from_tag handles the prefix + leading v, replacing the interim
resolve-release-version.sh). Plain function + anyhow at the binary
boundary — no Score / AppSpec / Topology ceremony for a single
component; introduce a spec when a second component needs releasing.
Slim variant of feat/fleet-release-score (which models release as a
ReleaseScore + AppSpec driven by harmony_cli).
