Per-cluster GPU node tables for the caller's team (the sinfo): node name, coarse state (ready / cordoned / offline / unknown), GPU type and total/used counts, and which allocation the node is assigned to ("slurm" for a claimed node, null otherwise).

Node names are the team's own hardware and are shown to the team only; data of other teams is never returned. Unusable capacity snapshots surface as a per-cluster capacity source with an error status, never as a silent empty node list.