Nest records gain a materialGrade field (server schema v8, blank for existing
rows) that is searched, sorted and versioned like the other metadata. The
Nest Info dialog gets a grade picker listing the machine configs' grades for
the chosen material; density survives only an unchanged name and grade. A
blank recorded grade keeps the archive's grade while the name matches, so
records saved before v8 do not lose it on open. Saved Nests shows a Grade column.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>