core: outside-influence fast path for swept samples (L138, output = v236)

Column-cache census matches assembler/world (the L77 share rise was relative, not more calls). Reuses the TN
predicate and skips relief/mouth/shell work for stamped samples outside the 1.053 m influence. vs assembler/world:
whole view -0.5..-4.0% on all layers; near-ready Surface World +0.3/+1.7, Floating Islands -4.3/+2.9, Tunnel Network
-2.5/+2.9, Vertical Shafts +4.7/+3.3 (A/A ±1%). 16/16 seeds, fast tier, Clang/GCC green.

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

Standalone/Core/src/ShapeWorldInternal.h

@@ -1313,11 +1313,7 @@ public:
             const bool passageTargetsNativeCaveField=queryStratum&&queryStratum->Resolved
                 &&queryStratum->Resolved->passageCapabilities.hasNativeCaveField
                 &&passage.lowerStrateIndex==queryStratum->StrateIndex;
-            const bool passageTargetsPlannedTunnelNetwork=queryStratum
-                &&queryStratum->Resolved
-                &&queryStratum->Resolved->generatorKind=="TunnelNetwork"
-                &&queryStratum->Resolved->recipeId=="Core.Caves.PrimitiveField"
-                &&queryStratum->Resolved->recipeVersion==1;
+            const bool passageTargetsPlannedTunnelNetwork=plannedTunnelStratum;
             const double mouthShellBlendMetres=passageTargetsPlannedTunnelNetwork
                 ?2.0:MouthShellBlendMetres;
             // Legacy native cave fields own the floor and mouth carve on their
@@ -1348,6 +1344,20 @@ public:
                 nearest.floorT=swept->floorT;
                 nearest.valid=true;
                 nearest.swept=swept;
+                if(!swept->hasExactContribution)
+                {
+                    // The prepared sentinel is farther from the route than the
+                    // maximum body, relief, shell, and blend support. Preserve its
+                    // exact flat distance in the passage union; its wall and floor
+                    // shell bounds are positive, so the rest of the composer has
+                    // no effect for this passage sample.
+                    const double outsideDistance=PassageFlatBottomDistance(
+                        static_cast<float>(swept->roundSignedDistance),
+                        swept->floorCenterZSubvoxels,qz,
+                        swept->floorDepthSubvoxels,qPerMetre);
+                    unionDistance=std::min(unionDistance,outsideDistance);
+                    continue;
+                }
             }
             else
             {