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A positional worksheet, not an automatic migration
The first logical record is treated as the header. Parsing recognizes comma, semicolon, tab and pipe candidates, quoted fields, doubled quotes, embedded line breaks and an initial UTF-8 BOM.
Only a unique exact normalized heading can be preselected, and that preselection remains unconfirmed. Duplicate and empty headings stay positional. The downloadable manifest is available only after every source column has a selected target, every row is explicitly confirmed, no target is reused, and no conflict remains.
Observed lexical shapes are sample descriptions, not declared types. The result does not prove business meaning, compatible units, null rules, keys, encoding, migration safety or data quality.