Function apply_import 

pub async fn apply_import(
    transport: &Transport,
    plan: &DataViewImportPlan,
) -> Result<DataViewImportReport>

Apply a previously planned data-view import without rereading or replanning.

Each object gets one final pre-write read. The server exposes no conditional write token, so the final verification read remains the smallest unavoidable race window. Earlier successful writes are deliberately never rolled back.