Insert the plan's middle resolution step for item slots: a curated
default baked into the GLB as a per-material 'pascal_material' extra
(three's GLTFLoader copies material extras to userData). Resolution per
slot is now: node.slots[slotId] override -> pascal_material curated
default -> authored GLB material. Bare ids resolve as library:<id>;
unresolved refs fall through. Runtime reads only the GLB (no DB).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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