KC-1465: Commander always uses enterprise name as the only name for root node

[IliaTheKeeper]

Fix root-node name display after it is renamed.

• Prefer the root node’s stored displayname over the enterprise name in enterprise-info and node paths.
• Allow resolving the root node by its new display name while retaining the enterprise name as a compatibility alias.
• Refresh cached node paths when node names or hierarchy change.
• Add coverage for tree, JSON/CSV output, node lookup, and cache refresh behavior.