MCRP / Research prototype

Response to domain adversarial review

Author-lane response, 2026-09-25. The original adversarial report remains separate in ../reviews/red-domains-law/; this document does not speak for that reviewer.

Finding Revision Evidence
D1: unconditional zero mean is insufficient Biology explicitly requires conditional zero mean given treatment and batch for its conditional-mean identity; the balanced binary counterexample is displayed test_unconditional_error_mean_does_not_supply_conditional_exogeneity
D2: crossed columns do not establish causation or exact additivity Explicit structural causal countermodel; additive_model_identification replaces the ambiguous scope token; average contrast, exact-additivity flag and exact additive coefficient are separate outputs test_same_crossed_observations_can_have_zero_causal_effect; test_interaction_is_not_mislabeled_as_an_exact_additive_effect
D2: interaction input mislabeled Contrasts 1 and 3 yield average 2, false exact-additivity flag and null exact additive coefficient; actual replay narrows the amended scope to arithmetic Same interaction regression exercises both oracle and receipt engine
D3: federal jurisdiction qualifier omitted Law now refers to covered federal proceedings, subject to applicability and exceptions; source ledger retains the institutional scope Official U.S. Courts pages rechecked; no live-case opinion claimed
D4: final reliance can select again Added separate finite-count example: 10 adverse of 100 completed, all 10 relied upon, hence shares 0.1→1 test_final_reliance_can_select_again_after_completion; undefined zero-reliance case also tested
D7: novice should see a completed card Biology adds a worked four-sentence card and interaction answer key before requesting abstract protocol fluency Teaching proposal only; no measured onboarding effect

All 20 domain tests pass in the regenerated run. Original working numerical cases retain their values. The more precise scope token is a fixture-schema change, not a claim of public wire-protocol compatibility. Original unchecked causal and institutional premises remain outside toy-engine authority.