Classification now lives exclusively on DocumentVersion. The field is
removed from the Document model, all SQL queries, GraphQL Document
type, SignableDocument type, UpdateDocumentInput, and MCP Document
schema.
New documents still accept classification in CreateDocumentInput,
applied to the first version. New drafts inherit classification from
the previous version. PDF generation uses the version classification.
The drawer allows editing classification on draft versions via the
updateDocumentVersion mutation. Classification is read-only on
published versions.
Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>
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