Python SDK v6.4.0

Added

• update_row on client.datasets (sync and async) — partially update a single dataset row by id. Send only the cells you want to change (input, output, expected_output, metadata, or custom values keyed by column identifier); omitted cells keep their current value. Custom values are merged onto the row's existing ones and validated against the dataset's active columns. Adds the UpdateDatasetRowResponse type.