Every branch read and compare re-points the references a document
holds to a file or a media object. The generic walk visited every map
of the document: 704 ms on a file of 90,720 shapes. The relinker now
visits only the places listed in `cfh/shape-ref-paths` (plus the paths
older data versions used, which binfile import still meets), compiled
once into closures that rebuild only what changed: 100 ms on the same
file, with an equal result. `remap-changes` dispatches on the change
type instead of walking whole change maps.
A new test derives every uuid path from the shape schema and fails
when a path is neither listed as a reference nor classified as none,
so a reference field added later cannot be missed silently. The grid
colour schema now declares the library reference it already carried.
AI-assisted-by: claude-opus-5-5
03eb22b945