The first consumer of the P1-A VERIFIED contract. Given an R2 problem (prose) +
the INDEPENDENTLY hand-authored gold SETUP, it builds a VerificationProof and runs it
through the contract. NOT a serving-time VERIFIED producer: it depends on the eval-lane
gold setup (off-serving only), cannot move any serving metric, cannot emit served
[verified]. Serving-time independence (a non-gold second reader) is a separate, larger
rung, explicitly deferred.
evals/constraint_oracle/verified_producer.py (placed in evals/, not core/, to avoid a
backwards core->evals import: it needs the reader+solver (generate), the canonical
signature + gold (evals), and the contract (core) — clean direction evals->core+generate):
- verify_r2(text, gold_setup) -> R2VerificationOutcome.
- Two independent reads: primary = read_constraint_problem(text) (lineage
constraint_reader_v1); independent = the gold-authored setup (lineage
constraint_gold_author_v1). Convergence = equal constraint_setup_signature digests
(the SAME function for both reads). The gold ANSWER never enters — only the gold
STRUCTURE, through the signature.
- A wrong reader structure diverges from the gold-authored structure -> reads_disagree
-> NOT_VERIFIED (the poison). Reader refusal -> no proof + a limitation. Solver
boundary -> boundary_clear False -> NOT_VERIFIED. VERIFIED state/claim reached ONLY
via disclosure_for_verification.
On the real r2_gold lane (13 records): VERIFIED=7 (exactly the 7 'solved'),
NOT_VERIFIED=6 (3 solver_refuses + 3 reader_refuses) — wrong=0.
11 tests: integration over real gold (verifies >=1, never on divergence); all 7 solved
verify; the poison (divergent independent read -> reads_disagree); reader-refusal -> no
proof + limitation; solver-boundary -> not verified; distinct/named lineages; the
sanctioned route; all digests populated; gold answer structurally cannot enter; off-serving.
NOTE (bound_slots_digest): the P1-A VerificationProof (merged, unchanged per scope) has
no bound_slots_digest field; the "bound to stated quantities" obligation is carried by
derivation_digest (hashed over the canonical constraints + solution). Flag to extend.
Off-serving; smoke 90/0.
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