Struct and schema for the read sub-entity of a render action.
The read entity controls how resource data is fetched and passed to the template.
Use :one cardinality to fetch a single record (available as record in the
template's data file) or :many to fetch a list (available as records, streamed
in batches for memory efficiency).
For the full DSL reference, see AshTypst.Resource.typst.render.read.