Revisioned document snapshot.
Fit corresponding to that document alignment.
Georeferenced preview/export pixels for that alignment.
Paper layout, projections and optional current map capture.
PDF Blob suitable for download; no host persistence is performed.
Create a local PDF with source identity, alignment diagnostics, GCPs, raster overview and an embedded full-precision alignment.json attachment. pdf-lib loads lazily.
Training residuals are not independent accuracy measurements. The caller must pass document, fit and raster from the same alignment; use a controller export result for its exact revision.