Phase 2.3: the first inference rule + the wrong=0 mechanism for proofs.
- generate/proof_chain/rules.py: evaluate_modus_ponens / evaluate_proof_conclusion.
Proof-layer dispatch (Option B) over proposition FORMULAS via the canonicalizer;
never touches check_admissibility/_resolve_dep_units (proofs have no units).
Disagreement rule = the select_self_verified twin: pool ALL admissible single-step
MP derivations, require a unique canonical key == declared conclusion. Pooling (not
filter-to-declared-first) is the soundness mechanism.
- generate/logic_canonical.py: parse_top_implication (+ _unparse) — recovers an
implication's syntactic antecedent/consequent (the ROBDD form doesn't preserve it).
- Closed typed-reason set; the corpus's finer labels consolidate (6 disagreement
refuse-labels -> conclusion_disagreement; 4 antecedent-flavor labels ->
unestablished_antecedent — same redundancy, same mechanism-makes-one-distinction
principle).
- Honesty boundary (exact scope): guarantees a unique conclusion among SINGLE-STEP MP
over the premises, NOT "uniquely entailed" by all strategies.
Cross-check: all 24 GPT-5.5 adversarial corpus cases agree on OUTCOME against the real
rule (no rule bug / no corpus outcome-misread); reasons consolidate as above.
Mutation: filter-to-declared-first makes DISAGREE-007/010 wrongly admit -> pooling
tests fail (pooling load-bearing).
Drive-by fix (cleanup-as-you-find): merged ADR-0204 ProofNode.__post_init__ was
dedented to module level -> all ProofNode validation was silently DEAD (smoke skips
the dedicated test file; the smoke != full-suite hazard). Re-indented; validation
restored.
Additive (math lane untouched). Full binding-graph surface green; smoke 67.
GPT-5.5's independent corpus caught that the canonicalizer refused quantified/
predicate input only by accident (tokenizer chokes on '.'), not by design — a
by-luck-not-by-design refusal the wrong=0 discipline rejects. ADR-0202 §3 names a
typed `out_of_decidable_regime` refusal; the keystone emitted a generic grammar error.
- logic_canonical.py: LogicRegimeError(LogicError) + OUT_OF_DECIDABLE_REGIME;
_reject_out_of_regime_text (quantifier words forall/exists + symbols ∀/∃, pre-scan)
and _reject_out_of_regime_tokens (predicate-application ATOM-then-LPAREN), run BEFORE
the generic grammar error. Refusal only — no predicate/FOL capability added.
- logic_equivalence.py: typed regime branch (before the generic LogicError branch).
- tests: 43 total (10 new) — OOR refuses with typed reason; equivalence path too;
genuine grammar errors stay plain LogicError (no over-fire); `not (P)` not mistaken
for predicate application. Mutation-verified by-design (neuter -> falls through to
generic grammar error).
- ADR-0201.1: additive sub-ADR of 0201 (not an amendment; sub-number preserves the
landed ADR-0203 forward refs + phase-2 plan numbering). Honesty boundary load-bearing.
Corpus now 22/22 (PC-OOR-001/002 agree on the principled reason). Full canonicalizer
suite green; smoke 67 passed. modus_ponens rule-reasons remain deferred to ADR-0205 (2.3).
