refactor(zkvm): canonicalize PI transcript/opening flow via instance_value + PublicValues#1277
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refactor(zkvm): canonicalize PI transcript/opening flow via instance_value + PublicValues#1277
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Replace raw public-input transcript absorption with circuit-driven instance_value indexing in prover, native verifier, and recursion verifier. Also add instance_value tracking in ConstraintSystem::query_instance and fix mutability/borrow fallout in public-value query helpers and RAM table address setup.
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This PR refactors how public inputs (PI) are represented and consumed across zkVM proving/verification so that PI handling is circuit-driven and consistent end-to-end.
Related to #1263.
Design rationale
Previously, PI transcript absorption and some verifier checks depended on broader/raw PI containers, which made ordering and indexing assumptions harder to audit and keep consistent across:
This PR moves PI consumption to a canonical, circuit-defined path:
instance_valuesdefines which scalar PI values a circuit observes (and in what order).instance_openingsdefines which PI MLE columns are opened.PublicValuesMLEs, rather than ad-hoc/raw vectors.This reduces ambiguity in PI ordering/indexing and aligns transcript-visible PI handling with circuit semantics.
soundness fix
This PR also fixed a soundness issue by removing
wit_in_evalsandfixed_in_evalsfrom the proof payload. Instead of trusting prover-supplied values for these evaluations, the verifier now deterministically derives them from the sumcheck evaluations during verification. This prevents a malicious prover from introducing mismatches between claimed eval vectors and the actual sumcheck-consistent values.