fix(walls): bound multi-wall repairs to finite rays

Issue: #271
User-Visible: yes

scripts/mutation-gate.mjs

@@ -292,6 +292,19 @@ export const MUTANTS = [
         + '      else if (envelope) localInside = intersection(localInside, envelope);',
     }],
   },
+  {
+    id: 'multi-wall-finite-ray-disabled',
+    guard: 'npx tsc -p tsconfig.test.json && node scripts/fix-test-build.mjs '
+      + '&& node --test --test-name-pattern="issue #271 keeps finite" '
+      + 'test/wall-thickness.test.mjs',
+    because: 'a degree-3 repair must stop at every real interval endpoint; restoring the '
+      + 'node-wide 8H rectangle recreates the phantom wall and light barrier from #271',
+    patches: [{
+      file: 'src/wall-thickness.ts',
+      find: '          const supportExtent = Math.min(extent, support.length);',
+      replace: '          const supportExtent = extent;',
+    }],
+  },
   {
     id: 'wall-exact-span-fallback-disabled',
     guard: 'npx tsc -p tsconfig.test.json && node scripts/fix-test-build.mjs '

scripts/smoke-links.mjs

@@ -43,11 +43,15 @@ export const SMOKE_LINKS = [
   {
     // #261: the browser observes the canonical wall/paper paths and downstream
     // geometries, while the pure bevel helpers remain internal to the bundle.
-    symbols: ['multiWallBevelTriangles', 'multiWallBevelTrianglesAt'],
+    symbols: [
+      'multiWallBevelTriangles', 'multiWallBevelTrianglesAt',
+      'buildMultiWallNodeMap', 'MultiWallNodeRay', 'MultiWallNodeRaySupport',
+    ],
     smokes: ['smoke_junction_patch_resilience.mjs', 'smoke_multiwall_junction.mjs'],
     because: 'the #197 smoke probes the repaired exterior wedge across Plan, View, kiosk, '
       + 'Static, hidden Iso and light barriers, while the #249 smoke proves the old excessive '
-      + 'wedge stays empty; neither browser scenario calls the pure bevel helpers by name',
+      + 'wedge stays empty, while #271 also proves finite ray endpoints across Plan, Static, '
+      + 'hidden Iso and light barriers; the browser scenarios call none of the pure helpers by name',
   },
   {
     // #258: the browser sees only the resulting path/caches; it cannot call