When deploying a second stack to k8s-kind, automatically reuse an existing
kind cluster instead of trying to create a new one (which would fail due
to port 80/443 conflicts).
Changes:
- helpers.py: create_cluster() now checks for existing cluster first
- deploy_k8s.py: up() captures returned cluster name and updates self
This enables deploying multiple stacks (e.g., gorbagana-rpc + trashscan-explorer)
to the same kind cluster.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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