Determinism Failure Story

A team ships a ranking update that looks fine in staging. In production, results drift. Users complain, dashboards light up, and debugging drags on for weeks.

The root cause was hidden non-determinism: an ANN index slipped into an exact path and an embedding update wasn’t captured in artifacts. No one could prove what happened because replay didn’t match.

With Bijux‑Vex, this would have been refused immediately. The system would have reported a deterministic violation and blocked the rollout until the exact contract was satisfied.