jev-table-import-mapper

Data import: maps an uploaded CSV's columns onto a destination table with a strict deterministic name-equality pass, then one Jev `Noul` per remaining (source, destination) pair plus a guard `Noul` per incoming column, mapping 10 of 10 columns of a 23-column export at 253 questions in one call, 915 ms, $0.0012, unmapped fields left visible above a 0.75 threshold rather than guessed.

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