Loads the ObjectClass enum map and adds object_class_name via translate_object_class,
including the context-aware Gem(11) classification (crystal/mana stone/gem/aetheria
by item name, using the original name before the material prefix). The rare
aetheria-by-IntValues path is documented as not reproduced (needs original_json).
Validated vs Python: 0 mismatches over 600 rows (3 queries incl. a 'crystal' text
search that exercises the gem context) for object_class_name, name, material_name,
item_set_name, value.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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