Complete the cluster decomposition: the 23 introspection helpers (capacity,
kubectl/ssh summaries, live-check, badges) move from cli/components_cluster.nu to
domain/cluster/introspect.nu. cli/components_cluster.nu now holds ONLY the 5
`main cluster *` verbs (963 -> 452 lines). introspect.nu imports downward only
(tools/nickel, domain/cluster/access, platform/clients/ssh, primitives/logging).
Exported 4 previously-private helpers (fmt-gib, k8s-quantity-bytes,
node-operator-labels, cluster-top-legend) so the cli verbs can call them across
the module boundary; dropped a dead comp-dag-summary import. component.nu repoints
its 11 helper imports to introspect.nu.
Verified: module-load of all touched modules (no cycle, no upward import); ADR-026
topology clean across the whole cluster subsystem; cluster --help + component list
run. Concludes slices 2a+2b: cli/components.nu 3611 -> 2410 (-33%).
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