Ported and narrowed from 90f977bf (evidence only; no boss-hull code). Names resolve
exactly against ShipModCatalog.ResolveCatalog over GameData/Aetheria.cc and GameData/Mods,
composed into a scratch file, the catalog the game boots; validation is one
Loadouts.Materialize on a throwaway ItemManager; the commit goes into Aetheria.cc only,
through Loadouts.Commit, with --boss-of in the same batch.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
