Decision-Theoretic Causal Diagnostics via Le Cam Deficiency // Implements Le Cam deficiency theory for causal inference, as described in Akdemir (2026) doi:10.5281/zenodo.18367347. Provides theorem-backed bounds together with computable proxy diagnostics for information loss from confounding, selection bias, and distributional shift. Supports continuous, binary, count, survival, and competing risks outcomes. Key features include propensity-score total-variation deficiency proxies, negative control diagnostics, policy regret bounds, and sensitivity analysis via confounding frontiers.