The JULIAN25 coupon demonstrates surprisingly sophisticated autonomous business logic: 25% off, single-use per customer, 10-redemption cap, and programmatic block on any redemption that would produce negative margin. This last constraint is the most interesting — it means Fable 5 calculated per-product margins at setup time and encoded a floor below which discounts cannot go. This isn't a human-designed business rule; it's an agent proactively preventing loss-making transactions. The architecture suggests Fable 5 modeled the commerce domain sufficiently to identify and prevent a specific failure mode (below-cost sales) before it could occur. Autonomous commerce with autonomous guardrails.