passages: floor profile by nearest centreline + metric distance outside voids (L114, v222) - WIP

Floor ribs are present in L109/L112/L113 rock tunnels too: the floor height comes from the
nearest segment, so it jumps (up to 5.9-7.3 cm) where the nearest segment switches. v222 reduces
them; faint ribs remain. Quiet-machine timing (load 0.64): near-ready 9-17% slower than L109
(FI W12 0.95 -> 1.10 s); candidate totals ~5x L109. Fast tier FAIL: 2 SW wall-shell probes of
31,381 read host air. Walk/grade audits pass; Clang/GCC deterministic; UE builds.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016dhxM43dnWvUu2B5Ph1iG1

Standalone/Research/WorldAssemblerM3/Linux114/captures/INDEX.md

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+# L113 and L114 floor captures
+
+L113 open-air close-ups are byte-checked copies of the verified L113 set. L113 and L114 rock-floor views and L114 open-air close-ups were rendered from their respective meshes. Each image passed the pixel check. Rock-floor anchors require an upward normal alignment of at least 0.85, a floor offset of at most 0.25 m, and a camera distance between 2.0 and 3.2 m.
+
+## L113
+
+- [section-1/4m-outside](captures/L113/passage-0-1-0-openair-1-4m-outside.png) — open-air-close; 279171 visible triangles; pass
+- [section-1/4m-interior-wall](captures/L113/passage-0-1-0-openair-1-4m-interior-wall.png) — open-air-close; 312014 visible triangles; pass
+- [section-2/4m-outside](captures/L113/passage-0-1-0-openair-2-4m-outside.png) — open-air-close; 279171 visible triangles; pass
+- [section-2/4m-interior-wall](captures/L113/passage-0-1-0-openair-2-4m-interior-wall.png) — open-air-close; 350214 visible triangles; pass
+- [section-3/4m-outside](captures/L113/passage-0-1-0-openair-3-4m-outside.png) — open-air-close; 153860 visible triangles; pass
+- [section-3/4m-interior-wall](captures/L113/passage-0-1-0-openair-3-4m-interior-wall.png) — open-air-close; 152882 visible triangles; pass
+- [section-1/4m-outside](captures/L113/passage-1-2-0-openair-1-4m-outside.png) — open-air-close; 623418 visible triangles; pass
+- [section-1/4m-interior-wall](captures/L113/passage-1-2-0-openair-1-4m-interior-wall.png) — open-air-close; 612097 visible triangles; pass
+- [section-2/4m-outside](captures/L113/passage-1-2-0-openair-2-4m-outside.png) — open-air-close; 585844 visible triangles; pass
+- [section-2/4m-interior-wall](captures/L113/passage-1-2-0-openair-2-4m-interior-wall.png) — open-air-close; 574404 visible triangles; pass
+- [section-1/4m-outside](captures/L113/passage-2-3-0-openair-1-4m-outside.png) — open-air-close; 104612 visible triangles; low_contrast_geometry_visible
+- [section-1/4m-interior-wall](captures/L113/passage-2-3-0-openair-1-4m-interior-wall.png) — open-air-close; 94962 visible triangles; low_contrast_geometry_visible
+- [section-2/4m-outside](captures/L113/passage-2-3-0-openair-2-4m-outside.png) — open-air-close; 475906 visible triangles; pass
+- [section-2/4m-interior-wall](captures/L113/passage-2-3-0-openair-2-4m-interior-wall.png) — open-air-close; 486760 visible triangles; pass
+- [rock-floor/57.5m](captures/L113/after/passage-1-2-0-rock-floor-midpoint.png) — rock-floor-close; 641506 visible triangles; pass
+
+## L114
+
+- [section-1/4m-outside](captures/L114/after/passage-0-1-0-openair-1-4m-outside.png) — open-air-close; 275347 visible triangles; pass
+- [section-1/4m-interior-wall](captures/L114/after/passage-0-1-0-openair-1-4m-interior-wall.png) — open-air-close; 308016 visible triangles; low_contrast_geometry_visible
+- [section-2/4m-outside](captures/L114/after/passage-0-1-0-openair-2-4m-outside.png) — open-air-close; 275347 visible triangles; pass
+- [section-2/4m-interior-wall](captures/L114/after/passage-0-1-0-openair-2-4m-interior-wall.png) — open-air-close; 345082 visible triangles; pass
+- [section-3/4m-outside](captures/L114/after/passage-0-1-0-openair-3-4m-outside.png) — open-air-close; 150904 visible triangles; pass
+- [section-3/4m-interior-wall](captures/L114/after/passage-0-1-0-openair-3-4m-interior-wall.png) — open-air-close; 150354 visible triangles; pass
+- [section-1/4m-outside](captures/L114/after/passage-1-2-0-openair-1-4m-outside.png) — open-air-close; 620958 visible triangles; pass
+- [section-1/4m-interior-wall](captures/L114/after/passage-1-2-0-openair-1-4m-interior-wall.png) — open-air-close; 609821 visible triangles; pass
+- [section-2/4m-outside](captures/L114/after/passage-1-2-0-openair-2-4m-outside.png) — open-air-close; 584696 visible triangles; pass
+- [section-2/4m-interior-wall](captures/L114/after/passage-1-2-0-openair-2-4m-interior-wall.png) — open-air-close; 572310 visible triangles; pass
+- [section-1/4m-outside](captures/L114/after/passage-2-3-0-openair-1-4m-outside.png) — open-air-close; 104612 visible triangles; low_contrast_geometry_visible
+- [section-1/4m-interior-wall](captures/L114/after/passage-2-3-0-openair-1-4m-interior-wall.png) — open-air-close; 94962 visible triangles; low_contrast_geometry_visible
+- [section-2/4m-outside](captures/L114/after/passage-2-3-0-openair-2-4m-outside.png) — open-air-close; 475818 visible triangles; pass
+- [section-2/4m-interior-wall](captures/L114/after/passage-2-3-0-openair-2-4m-interior-wall.png) — open-air-close; 486490 visible triangles; pass
+- [rock-floor/57.5m](captures/L114/after/passage-1-2-0-rock-floor-midpoint.png) — rock-floor-close; 636304 visible triangles; pass