Registered entity name that was compared.
OptionalErrorPopulated when Success is false.
The per-field delta matrix. Only fields with at least one non-empty value are included.
The loaded records, in input column order.
Whether the comparison succeeded.
The serializable result of comparing a set of records: the loaded records plus a per-field delta matrix. This is the LLM "deltas" payload and (eventually) the UI side-by-side model — it is plain-data only and contains no BaseEntity instances.