mrwulf 67d9cfed43 S3.5 Fable re-audit: permanent non-vacuity witness + honest ledger ...

Adversarial re-derivation of S3.5 (drill after harness switch). Core
verdict CONFIRMED: extractIncl_correct is faithful and non-vacuous.
Three methodical flaws found and resolved:
- F1: the non-vacuity proof existed only as a deleted probe — evidence
  discarded. Now permanent: extractIncl_nonvacuous proves the
  extractor's output on a NON-forgery input is NOT a collision, so the
  correctness conclusion is false for some inputs and cannot be
  discharged by pigeonhole/choice. Guards against future drift back
  into vacuity. Cone pinned.
- F2 (queued for S4): deleting root_binding discarded the receipt-
  uniqueness content of Lemma 2 (left disjunct: P = Path m D) along
  with its vacuous disjunct. To be restored in extractor form during
  S4; the S4 consistency walk inlines the same argument regardless.
- F3: README still claimed 'root_binding done' — a deleted theorem
  advertised as delivered. Ledger corrected.

15 certs green. LTL untouched.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-07-11 16:38:34 +02:00

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