Production-simulated marketplace ranking system with display-rank logging, candidate generation, temporal holdout evaluation, IPS correction, delayed attribution, exposure governance, offline A/B simulation, MetaSignal export, and failure defense.
Truth boundary: solo-built, non-production, production-simulated. No real production deployment, real users, real traffic, or real online A/B test.
| Holdout NDCG@10 | 0.13341 |
| Raw NDCG@10 | 0.52751 |
| IPS-weighted NDCG@10 | 0.52224 |
| After seller Gini@10 | 0.58228 |
| After catalog coverage@10 | 0.22615 |
| MetaSignal-compatible events | 15 |