Namespace is now managed by Argo's spec.destination.namespace (nxtgauge)
This stops the permanent OutOfSync noise from duplicate namespace definitions.
Adds Kustomize base+prod overlays for nxtgauge-frontend-solid,
nxtgauge-admin-solid, and nxtgauge-backend-rust (18 services).
ArgoCD Image Updater configured for auto-deploy on high-performance-latest tag.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>