Local deterministic demo exposing the formal entailment substrate as its
own public authority: the proposer's verdict/confidence/proof are data
only; CORE recomputes propositional entailment through the pinned ROBDD
engine (generate.proof_chain.entail.evaluate_entailment_with_trace),
independently cross-checks with the deductive lane's code-disjoint
truth-table oracle (evals.deductive_logic.oracle.oracle_entailment), and
serves entailed/refuted/unknown only when both procedures agree —
refusing on inconsistent premises (no vacuous entailment), out-of-regime
input (by design, before grammar), a distinct-atom regime bound (honors
the brute-force oracle's small-atom contract), and engine/oracle
disagreement (test-only fault injection, defensive refusal).
Seven committed scenarios with byte-pinned expected artifacts; 38 tests
covering recursive schema closure, output-smuggling-before-evaluation,
proposer-garbage byte-invariance in both directions, oracle module
disjointness, trace-hash folding of trace + oracle verdict, runner
hardening, and INV-21/24/29 discipline of the demo files.
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