9a418a7711
Follow the same pattern used for classification: document type now lives exclusively on DocumentVersion. A migration copies existing values from documents to their versions. The document filter uses a subquery on the latest version. All three API surfaces (GraphQL, MCP, CLI), resolvers, frontend, and e2e tests are updated accordingly. Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>