- HachimojiN8: n8_is_minimum had inverted truth (claimed allOk=true for N<8
but the theorem proves allOk=false for all N<8). Fixed statement.
- Tests: 9/9 Lean module tests passing (FeasibleSet, RRC Emit, Q16_16Manifold,
FixedPoint, SidonSets, InteractionGraphSidon, GoormaghtighEnumeration, HachimojiN8)
- Entry gate now checks GoormaghtighEnumeration (2 known Goormaghtigh collisions:
31 and 8191) as a cached-artifact check (heavy decide ~480K quadruples)
- SidonSets added to entry gate (Erdos bounds on Sidon sets)