Adds an `operator_application()` helper that builds an
`ArgoApplication` targeting
`oci://<registry>/<project>/harmony-fleet-operator:<chart_version>`.
main.rs composes it into `ArgoHelmScore { argo_apps: vec![...] }` —
no new score types, no wrapper module.
CLI gains `--use-argo` to swap the operator path from direct-helm
to Argo, plus `--operator-chart-version` as the CD knob CI re-runs
to deploy / upgrade / roll back.
Splits `ArgoApplication.destination_namespace` from
`metadata.namespace` so the Application CR can live in `argocd`
while syncing chart resources into `fleet-system` — `to_yaml`
previously collapsed them, breaking any cross-namespace deploy.
NATS + agent stay on the direct path in v1; flattens
`harmony_cli::Args` into the binary's CliConfig so `--yes` makes it
through one argv parse.
Tested on a fresh k3d cluster against the published
`hub.nationtech.io/harmony/harmony-fleet-operator:0.0.1`.
Jean-Gabriel Gill-Couture
0992183438