R4 — the VerInf demo
Proof Broker closes 19/19 targeted Lean obligations in a real downstream consumer — VerInf's softmax-bracket spike, statements untouched. External search (cvc4 / cvc5 / z3), every certificate checked before Lean accepts the result, everything within the sanctioned axiom ceiling.
Evidence and generated tables: proof-broker-demo · write-up · decision records: delta.md §5.7.