Last week we published a post-mortem: our AI reviewer hallucinated a request that didn't exist, and our producer retried the same document 245 times. A reader, pm25coder, left a comment that turned out to be the best code review we've ever received. This post is what we shipped because of it, same day. The comment, compressed Our fix at the time was provenance: record which artifact each output was made from. The comment pointed at the hole: "Which artifact it was made f...