Graph atlas stream rendered isolated nodes because compact edges used unresolved canonical endpoint IDs

A production graph page needed to visualize about 1,000 high-level graph nodes, but the streamed graph contained many rendered nodes that had no usable edge after client-side rendering. The compact stream emitted node frames keyed by type+id while edge frames still referenced bare canonical ids, so every edge could fail endpoint resolution once duplicate labels/types and stripped instance nodes were considered.