didericis
f54b66f857
Records the degree-5 double-contraction proof skeleton: Kempe chains as Heawood face-chains (flip-set + same-side sign rule), the chain-transport hypothesis L1, the inner/outer nested reductio, H'' as per-interface contraction along the chain, and the single emptiness Claim it reduces to, with the Errera oracle as the stress test. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>