CSV Column Mapping Plan

Builds an explicit CSV import mapping from supplied headers and rules to required destination fields. Flags missing source headers, duplicate destinations and missing required targets. Does not parse or modify a CSV file. Uses explicitly supplied structured inputs. Server computations are transient; the standalone website computes locally in your browser. Review the output before exporting it. No persistent account records, external source retrieval, sending, transactions or paid model calls. CSV/JSON review and export are available on the standalone website. MCP requests are capped at 128 KiB and computed responses at 256 KiB; individual field and record limits also apply.