Generate a consolidated health report across multiple OpenShift clusters. Verifies each kubeconfig context is a genuine OpenShift cluster before reporting. Non-OpenShift contexts are skipped by default. Collects node resources (CPU, memory, GPUs), namespace counts, and pod status into a single comparison view. Use when: - "Show me a report across all clusters" - "Compare cluster health" - "Multi-cluster status overview" - "How are my clusters doing?" - "Include all clusters including non-OpenShift" (override default filter) NOT for single-cluster deep-dives or troubleshooting specific pods.