Data Cleaner

Clean, standardize, and structure messy tabular data (CSV, Excel) into analysis-ready form. Use when the user has messy data that needs fixing: inconsistent formats, duplicate rows, missing values, mixed date formats, inconsistent categories/spellings, merged or split columns, junk rows, or data scattered across a badly-structured sheet. Triggers on "clean this CSV", "my data is messy", "standardize these columns", "remove duplicates from", "fix the dates in this file", "this spreadsheet is a mess", "dedupe my contact list", or when someone uploads tabular data that obviously needs cleaning before use. Produces a clean file plus a summary of what was changed.