Create a new layout with metadata and optional inline bulk data
metadata field must include simulationParams with array configuration (arrayType, gcr, tilt, etc.).topologySummary provides component counts (inverters, combiners, strings, tables).bulkData directly in the request body.GET /layouts/{layout_id}/data.format field specifies the bulk data serialization format: "json" (default) or "arrow".layoutId, globalLayoutId, name, version, snapshotHash, and dateCreated.