This endpoint returns a single lead by ID along with its full checklist, documents, action logs, matching leads, and scheduling state. The response is the same standardized shape used by the create and update endpoints.
Full checklist for the lead, grouped by checklist group. Each group includes
id, name, conditions, and an items array. Each item includes id,
checklistItemId, value, status, itemOverride, and a nested checklistItem with
code, label, fieldType, conditions, validationRules, etc. File-type items
include a documents array with presigned URLs.