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Explicit reviewed column mapping aligns exact removed-to-added CSV headers without changing source data. Raw structural changes remain visible; type/nullability changes and expected-schema violations still require review. One-to-one mappings require explanations and reject ambiguous endpoints, duplicate keys and oversized input. HTML pairs mapped columns and escapes labels.
Validated with 36 tests, 98.91% branch-aware source coverage, strict types, formatting/lint, dependency audit, Linux/Windows/macOS CI and CodeQL. Exact-tag wheel also passed all 36 tests in a fresh environment. Distributions built by the v1.2.0 tag workflow and verified against tagged Python sources.
Prepared with Codex assistance and independent implementation review.