Resolves Soul's five findings on cut-interval-ops.h2 and carries the rulings
operator-wells-contract-vs-ceiling and operator-analytic-wall-body. glsl-lowering
r2 and site-ground r3 now depend on interval-ops r3; the site-ground spec names
the one shipped void with (Rc, e) derived from (Rh, S) and the body-start word.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>