Three things that get called an audit trail and aren't.

Three things that get called an audit trail and aren't. I've shipped all three: 1. Output archive. You kept what the pipeline produced, not what it decided. The result without the reason. 2. Error log. Only failures wrote a row, so every quiet wrong answer is invisible. 3. Model-written summary. A second generation describing the first. Plausible, unverifiable. Working out what a real one needs, one item at a time. More as I test them.