Simplify raw assets: remove raw_staging bundle and use data/questions as canonical question input

Replace raw tree with compressed bundles for HF-native build flow

Fix bank/drug question configs to JSONL for viewer compatibility

Refresh bank/drug questions and flatten bank staging files

Add raw corpus assets and finalize LakeQuest subset configs

Add LakeQuest question subsets and raw staging assets

Add LakeQuest bank and drug corpus subsets