Canonical JSON Schema documents for the artifact formats used by
datadag. Each URL below is the $id declared inside the schema it
serves. These documents are generated from the Pydantic models that define them, so the
published schema and the implementation cannot disagree.
A URL path ending /v1 identifies the major version of the format. Additive changes
keep the same identifier; a change that removes or renames a field, or adds a required one,
gets a new one.