C.28:12.1 - C.29 mathematical-lens relation

C.29 may describe a mapping as abstraction-like, quotient-like, coarse-graining-like, simulation-like, or macro-model-like. It does not decide causal support. When intervention, policy, counterfactual, causal explanation, or causal decision use is current, apply C.28; otherwise record no causal-use claim or the exact blocker.