feat: comprehensive Kubernetes (kubectl) ecosystem support

Context

RTK has basic kubectl support (pods, services, logs) in src/container.rs but many common commands and global flags are missing.

Current state

Command	Status	Filter
kubectl get pods	Rust	Compact table
kubectl get services	Rust	Compact table
kubectl logs <pod>	Rust	Dedup
kubectl <other>	Passthrough	No filtering

Missing global flags (priority)

All kubectl subcommands support these flags but RTK ignores them:

• --context — multi-cluster (essential for devops)
• --kubeconfig — custom config file
• -n / --namespace — only on pods/services, not on other subcommands
• -l / --selector — label selector
• --as / --as-group — impersonation

Scope — TOML filters preferred

Command	Description	Approach	Expected savings
kubectl get deployments	Deployment list	TOML — strip headers, compact table	60-70%
kubectl get nodes	Node list	TOML — strip headers, compact	60-70%
kubectl get configmaps	ConfigMap list	TOML — compact table	60-70%
kubectl get ingress	Ingress list	TOML — compact table	60-70%
kubectl get all	All resources	TOML — strip empty, compact	70-80%
kubectl describe pod	Pod details	TOML — strip events noise, keep status	70-80%
kubectl describe node	Node details	TOML — strip conditions/events noise	70-80%
kubectl apply -f	Apply output	TOML — short-circuit on "configured/created"	80-90%
kubectl top pods	Resource usage	TOML — compact table	50-60%
kubectl top nodes	Node usage	TOML — compact table	50-60%
kubectl rollout status	Rollout status	TOML — short-circuit on success	80%
kubectl exec	Exec passthrough	No filter needed	0%

Global flags (Rust change needed)

The KubectlCommands enum in main.rs needs a shared struct for global flags (--context, --kubeconfig, -n, -l, --as) forwarded to all subcommands. This is a Rust change in main.rs + container.rs.

Implementation priority

1. Global flags (Rust) — --context, --kubeconfig, -n, -l on all subcommands
2. TOML filters — kubectl-describe.toml, kubectl-apply.toml, kubectl-rollout.toml
3. Additional get resources — TOML for deployments, nodes, configmaps, ingress

References

• Current implementation: src/container.rs (kubectl_pods, kubectl_services, kubectl_logs)
• PR #426 (@jordi-murgo): global flags implementation (inactive, available for reference)
• Rewrite rules: src/discover/rules.rs (kubectl already has rewrite)