v1.0.2

Bug Fixes

• fix: prefer header match over column letter for ambiguous keys like ID/URL (#1, thanks @dandaka)

  Headers matching /^[A-Za-z]{1,3}$/ (e.g. ID, URL) were misinterpreted as column letter references, inflating row width to hundreds of empty columns on append. Header name match now takes priority; column letter interpretation is fallback only when no header matches.