The shared marching-cubes mesher applies its 8-cell block proofs at step 2 for standalone shape contexts
and skips density-grid fills outside certified-uniform blocks (plus a one-sample normal halo); mixed and
unknown blocks still sample exactly. FI certified-air boxes 1,959 -> 14,119; FI LOD1 samples -63%. FI whole
view 7.08 -> 5.61 s (-21%), moving p50 about -33%; SW unchanged. Geometry hashes identical (no version
bump); proof audit 36.9 M samples, 0 violations, Clang and GCC. Source stamp now covers the standalone
mesher copy. Research R21 (deepened): native Core cave generator design.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1
