`// data_test` checks are verifier probes the DuckDB executor splices around a
managed write. A warehouse relation is written by the script itself, in any
language, so nothing would run them — and unlike the DuckLake `manual` case,
which at least fails loudly in that executor, a declarer in another language
deployed green with its data-quality assertions silently skipped.
Covered in the deploy-contract test and documented beside the annotation.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>