Description

Allow users to specify a custom field delimiter (e.g., TSV with \t, pipe-separated |) so the tool can handle data formats beyond comma-separated.

Acceptance Criteria

• -d / --delimiter flag accepts a single character
• Tab delimiter can be passed as --delimiter $'\t' or as a named alias --tsv
• Defaults to , (standard CSV) if not specified
• Documented in --help output and README

Notes

• This is a common ask for TSV files exported from spreadsheets