Use when reading, explaining, editing, or authoring Coalesce V1 YAML nodes (nodes/<LOCATION>-<NAME>.yml) — the node format the UI/API also generates. Covers the file shape, the id-based column lineage graph, safe edits, and the checklist for authoring a new V1 node by hand (Source nodes, config-driven types, or when no fileVersion 2 node type exists).
