coverage_audit measures index coverage per decoded sub-mesh. 8586 of them
reference their last vertex exactly, so the 'buffer not covered' gate is well
founded -- but 18 had NEGATIVE slack: indices up to 364 vertices past the end of
their own buffer, emitted because anchor_grouped_meshes reads pre-pivot
sub-meshes unconditionally. Quality gates stay relaxed there (a tiny flat lead
part is legitimately poor) but index range is now required.
Coverage 6069/6294 unchanged, inconsistency 56 unchanged, truth table still 46/46
claimed, suite green; the vertex total drops by exactly the 1546 garbage verts.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
