Observable by Design, or Liable by Default: What the EU AI Act Actually Requires of Your Audit Trail

The Act's mandatory audit artifacts — the Annex IV technical file, Article 72 post-market monitoring, the Article 50 transparency records — are the same observable-by-design practices the KellerAI corpus argues are simply correct engineering. The Act puts a deadline and a penalty on the discipline teams were already supposed to have, and this paper maps every obligation to its evidence artifact.