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Parses CSV text (RFC 4180, caller dialect) against a column type map and reports, per cell with row, column, physical line and byte offset, everything that would change on a parse-serialize-parse round trip or when opened in Excel or Sheets: leading zeros stripped, integers beyond 2^53 or 15 significant digits, scientific-notation and date coercion ("1E5", "1-2", "MARCH1"), formula injection (= + - @, tab, CR, LF, full-width forms), cells over 32,767 characters, embedded newlines and CRLF, and quoted-empty vs unquoted-empty vs NULL-token ambiguity. For agents that export or ingest CSV and must not corrupt identifiers or numbers. It reports hazards for the stated types; it does not convert or escape the data, and it does not execute formulas.