feat(models): Model Governance Registry — champion/challenger + historic + DataClass classifiers - #272
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…ic, DataClass classifiers Extends the model plane beyond LLMs to governed business targets (fraud/churn/credit/ AML/propensity): champion-vs-challenger with metrics, historic version comparison, PSI drift, and the DataClass classifiers governing each target's data. Promotions gate through eval (fail-closed) as RunReceipts; regulated targets need examiner sign-off. Model risk management as a witness surface. Feed-driven; producer + README + contract extended; 9 tests.
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Expands the model plane past foundation models to the governed business-model registry the regulated pitch needs (extends #271).
docs/surfaces/model-governance.html— every business target (fraud · churn · credit · AML · propensity) with:inference-gateway-intersection.mdextended with the governed-model-plane section; feed-driven (data/model-governance.json+ producer, 9 tests); cross-linked with the foundation-model catalog.Verified: feed valid; 9 pytest pass; producer round-trips.