interval-ops r4 fixes verdict s2's four findings (LOD agreement against a
converged march, body depth in optical depth, the wells oracle measurement,
the WeightBound pin); its wells assertion waits on question wells-ceiling-oracle.
glsl-lowering r2 merges onto 3ac7250a.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
