airtable.syncCsvData sends raw CSV to an existing Sync API endpoint.
automations/sync-airtable-csv.automation.ts
csv accepts at most 2 MB, 10,000 rows, and 500 columns; Airtable limits this endpoint to 20 requests per five minutes per base. It returns no value. This endpoint requires a Personal Access Token—not OAuth—with data.records:write and schema.bases:write, base creator access, and a supported Airtable plan.