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rke2: taint control-plane nodes NoSchedule
## Why
- The 3 control-plane/etcd nodes (prodnxsr0001/0002/0003, roles::infra::k8s::control) carry NO taints, so regular workloads schedule onto the controllers.
- Controllers should run only control-plane and tolerating workloads.

## How
- Add `node-taint: node-role.kubernetes.io/control-plane=true:NoSchedule` to `rke2::config_hash` in `hieradata/roles/infra/k8s/control.yaml` (control role only; compute/agent nodes untouched).
- `rke2::config_hash` deep-merges, so the taint layers onto the existing control config and renders into `/etc/rancher/rke2/config.yaml` node-taint list.
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production puppet-control repository
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