ADR 0003: Field loaders are batch by default

Status: accepted (2026-09-09)

An entity field resolver receives parents[] and returns results[]. The executor projects level by level, so one loader call serves every parent at that depth, across lists and pages. N+1 cannot be written by accident; per-parent loading is the explicit special case (@load(single)).

Consequences: resolver signatures differ from GraphQL's; rayfold explain shows one loader call per level.