core: coarser smooth-route tolerance + shell support bound (L119, evaluator v224)

Chord error 2.5 -> 10 cm, shell work skipped outside the 0-0.75 m band. Sweep pairs -39%, prepare -60%,
near-ready 3-8% faster than L115 but still +13..+22% vs L109. Floor offset 7.88 mm; captures match L115
by eye; fast tier, walk audits, Clang/GCC W1/W8/W12 determinism green. Not for merge yet.

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

Standalone/Research/WorldAssemblerM3/Linux119/captures/L119/INDEX.md

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+# L119 captures (L115 view set)
+
+The 23 L115 camera poses were rendered with the L119 binary. Floor anchors require an upward normal alignment of at least 0.85, target-to-floor distance at most 0.25 m, and camera-to-floor distance between 2.0 and 3.2 m. Open-air sections have outside and interior wall close-ups at 4 m.
+
+- [passage/0-1/0 rock-floor/401.7m](L115/L115/passage-0-1-0-rock-floor-station-1.png) — rock-floor-close; 122294 triangles; pass
+- [passage/0-1/0 rock-floor/792.8m](L115/L115/passage-0-1-0-rock-floor-station-2.png) — rock-floor-close; 586092 triangles; pass
+- [passage/0-1/0 rock-floor/1634.5m](L115/L115/passage-0-1-0-rock-floor-station-3.png) — rock-floor-close; 137288 triangles; pass
+- [passage/1-2/0 rock-floor/27.0m](L115/L115/passage-1-2-0-rock-floor-station-1.png) — rock-floor-close; 652056 triangles; pass
+- [passage/1-2/0 rock-floor/52.9m](L115/L115/passage-1-2-0-rock-floor-station-2.png) — rock-floor-close; 636162 triangles; pass
+- [passage/1-2/0 rock-floor/78.9m](L115/L115/passage-1-2-0-rock-floor-station-3.png) — rock-floor-close; 580472 triangles; pass
+- [passage/2-3/0 rock-floor/323.4m](L115/L115/passage-2-3-0-rock-floor-station-1.png) — rock-floor-close; 474964 triangles; low_contrast_geometry_visible
+- [passage/2-3/0 rock-floor/333.4m](L115/L115/passage-2-3-0-rock-floor-station-2.png) — rock-floor-close; 494504 triangles; pass
+- [passage/2-3/0 rock-floor/343.4m](L115/L115/passage-2-3-0-rock-floor-station-3.png) — rock-floor-close; 485356 triangles; pass
+- [passage/0-1/0 section-1/4m-outside](L115/L115/passage-0-1-0-openair-1-4m-outside.png) — open-air-close; 275333 triangles; pass
+- [passage/0-1/0 section-1/4m-interior-wall](L115/L115/passage-0-1-0-openair-1-4m-interior-wall.png) — open-air-close; 308012 triangles; low_contrast_geometry_visible
+- [passage/0-1/0 section-2/4m-outside](L115/L115/passage-0-1-0-openair-2-4m-outside.png) — open-air-close; 275333 triangles; pass
+- [passage/0-1/0 section-2/4m-interior-wall](L115/L115/passage-0-1-0-openair-2-4m-interior-wall.png) — open-air-close; 345026 triangles; pass
+- [passage/0-1/0 section-3/4m-outside](L115/L115/passage-0-1-0-openair-3-4m-outside.png) — open-air-close; 149234 triangles; pass
+- [passage/0-1/0 section-3/4m-interior-wall](L115/L115/passage-0-1-0-openair-3-4m-interior-wall.png) — open-air-close; 148100 triangles; pass
+- [passage/1-2/0 section-1/4m-outside](L115/L115/passage-1-2-0-openair-1-4m-outside.png) — open-air-close; 620814 triangles; pass
+- [passage/1-2/0 section-1/4m-interior-wall](L115/L115/passage-1-2-0-openair-1-4m-interior-wall.png) — open-air-close; 609757 triangles; pass
+- [passage/1-2/0 section-2/4m-outside](L115/L115/passage-1-2-0-openair-2-4m-outside.png) — open-air-close; 584542 triangles; pass
+- [passage/1-2/0 section-2/4m-interior-wall](L115/L115/passage-1-2-0-openair-2-4m-interior-wall.png) — open-air-close; 572258 triangles; pass
+- [passage/2-3/0 section-1/4m-outside](L115/L115/passage-2-3-0-openair-1-4m-outside.png) — open-air-close; 104612 triangles; low_contrast_geometry_visible
+- [passage/2-3/0 section-1/4m-interior-wall](L115/L115/passage-2-3-0-openair-1-4m-interior-wall.png) — open-air-close; 94962 triangles; low_contrast_geometry_visible
+- [passage/2-3/0 section-2/4m-outside](L115/L115/passage-2-3-0-openair-2-4m-outside.png) — open-air-close; 475860 triangles; pass
+- [passage/2-3/0 section-2/4m-interior-wall](L115/L115/passage-2-3-0-openair-2-4m-interior-wall.png) — open-air-close; 486480 triangles; pass