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Some DfE supporting-files CSVs have a UTF-8 BOM on the first column,
causing it to be named '\ufefftime_period' instead of 'time_period'.
This trips Singer schema validation ('time_period' is a required property).
Strip the BOM from all column names after read_csv.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>