Export files

Month selection and role-specific TSV generation. Column builders and release gates are in reviews/downstream.ts.

Source files

File	Responsibility / entry points
`src/features/exports/exports-page.tsx`	Month selection, download requests and Blob creation. ExportsPage, ExportsLoading
`src/features/exports/month-export.ts`	Export role/kind checks, month normalization, eligibility filtering and TSV construction. ExportKind, assertExportRole, parseExportMonths, exportMonthSummary, escapeTsvCell, generateMonthExport

File	Responsibility / entry points
`src/features/exports/month-export.test.ts`	Checks month export. Example: “month sets validate, deduplicate and select only current completed reviews”.