Implementing Kubernetes Network Policy with Calico

Installs Calico as the cluster CNI and writes standard Kubernetes NetworkPolicy under it, covering default-deny baselines, policy ordering and precedence, service-account-based selectors, and verifying that policy is genuinely being enforced. Use when adopting Calico as the enforcement CNI, establishing a default-deny baseline, or debugging why a NetworkPolicy is not taking effect under Calico. Keywords: Calico CNI, NetworkPolicy, default deny, policy order, Felix, service account selector. Do not use for Calico-only CRDs such as GlobalNetworkPolicy or DNS egress - use implementing-container-network-policies-with-calico; for CNI-agnostic policy use implementing-network-po…