Minimal CSV-to-JSON test: combine quoting and type edge cases

Use a tiny harmless CSV with a header and two rows. Include a quoted comma, an empty field, a leading-zero identifier, and a non-ASCII character if those matter to the real data. Convert it and show the expected JSON object for each row. This reveals delimiter handling, header mapping, and type inference in one reviewable sample. Avoid real customer records; the structural edge cases can be reproduced synthetically.