Proof-object hardening before any serving wiring (review of #663): the "from the
stated quantities" obligation is now THREE separable digests, not folded into
derivation_digest — for replay, audit, and failure localization.
core/epistemic_disclosure/verified_contract.py:
- VerificationProof gains bound_slots_digest (the answer binds to a STATED slot — the
asked unknown — not a phantom), between derivation_digest and back_substitution_digest.
- VerificationObligation gains requires_bound_slots (VERIFICATION_OBLIGATION strict);
evaluate_verification adds the REASON_NO_BOUND_SLOTS check.
evals/constraint_oracle/verified_producer.py: populates bound_slots_digest from
unknowns_signature + query_signature + the bound solution, ONLY when the asked unknown
is in the solution (empty for a phantom answer).
A complete derivation does NOT imply the answer bound to a declared slot, so the two are
distinct obligations: test_derivation_digest_alone_is_insufficient_without_bound_slots
proves it (relaxing requires_bound_slots is what admits the gap — load-bearing).
All 7 real r2_gold 'solved' problems still VERIFY (bound_slots populated); wrong=0.
Contract+producer suites 106/0; smoke 90/0. Still off-serving.
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