homelab: add k8s verb-group (v0.2) — the biggest remaining surface

Mining the post-v0.1 corpus showed kubectl is the dominant remaining domain by
far: 11,291 commands across 243 sessions (more than everything else combined).
This adds the full k8s verb-group built on an app→namespace→pod resolver (most
namespaces hold one app, so <app> defaults to the namespace and the target
defaults to deploy/<app>, letting kubectl resolve the pod; -n/--pod/-c/-l/--tty
override).

Read: status (pods + non-Normal events), get, logs, describe, debug (one-shot
triage), pf, rollout-status. Write/operational: db (the dbaas psql/mysql exec
pattern — PG via pg-cluster-rw -c postgres, MySQL via mysql-standalone-0 with the
env-password bash wrapper, never inline), exec, rm-pod (pods/jobs ONLY), restart.
Config-mutation verbs (apply/edit/patch/scale/create) are deliberately NOT
exposed — they stay raw per the Terraform-only policy.

Smoke-verified read verbs against the live cluster (get/logs/rollout-status);
write verbs are unit-tested (resolver, db-plan, shell-quoting) but not fired at
live state.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

cli/homelab.go

@@ -14,6 +14,7 @@ func buildRegistry() []Command {
 	reg = append(reg, claimCommands()...)
 	reg = append(reg, tfCommands()...)
 	reg = append(reg, workCommands()...)
+	reg = append(reg, k8sCommands()...)
 	return reg
 }