feat(core): slab + sparse motifs, slice 1 -- flat field, monolith, platform at 0.52 s (L56); research R25

Motif vocabulary v3: version-1 records keyed by (seed, strate, stable ID) with route keepouts, band
clearance and pairwise spacing. A rounded capped-cylinder monolith (r 1.4 m, 24 m tall) and a rounded-box
plinth, smooth-unioned into a flatField floor with a 0.55 m geometric rounding (measured fillets 0.73-1.17 m).
Exact radial/box interval bounds, a BVH, isTileShapeFree aware (0 brute-force misses, false-proof controls
rejected). Final-field route passes; whole-surface audit covers foot, cap and platform edges. Cold whole
view 0.524 s. Owner world unchanged. fast/medium/full PASS (Clang and GCC).
Research R25 (self-checked): FloatingIslands LOD0 column cache conflicts.

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

Standalone/Source/StreamBenchmarkHeadless.cpp

@@ -71,6 +71,7 @@ namespace
         bool AuditOreVeinYield=false;
         bool AuditLandmarkReachability=false;
         bool AuditNativeCaves=false;
+        bool AuditMotifIntervals=false;
         bool TlsProbeRequested=false;
         int TlsProbeWorkers=0;
         std::string TlsProbeTouch="none";
@@ -1142,6 +1143,7 @@ namespace
                     "  --transition-mode=hard|gradient|interleaved --transition-width-chunks=N (fixture override)\n"
                     "  --audit-resolved-layout-passages (capsule, support, route-binding and blocked-control audit)\n"
                     "  --audit-heightfield-profile (brute-force the profiled field intervals and route)\n"
+                    "  --audit-motif-intervals (brute-force motif bounds, BVH and shape-free guards)\n"
                     "  --audit-landmark-reachability (capsule, support, grade and buried-L43 control)\n"
                     "  --audit-native-caves (arrival-to-departure capsule flood fill and interval oracle)\n"
                     "  --audit-surface-clearance (sample biome terrain/caps against the resolved ceiling)\n"
@@ -1168,6 +1170,7 @@ namespace
             }
             if(arg=="--world-assembler-prototype")options.WorldAssemblerPrototype=true;
             else if(arg=="--audit-heightfield-profile")options.AuditHeightfieldProfile=true;
+            else if(arg=="--audit-motif-intervals")options.AuditMotifIntervals=true;
             else if(arg.starts_with("--world-assembler-manifest-output="))
                 options.WorldAssemblyManifestOutputPath=std::filesystem::path(std::string(
                     arg.substr(std::string_view("--world-assembler-manifest-output=").size())));
@@ -1429,6 +1432,34 @@ int main(int argc,char** argv)
         if(!StandaloneWorldAssemblyPrototype::BuildResolvedLayoutSnapshot(
             *ownerWorld,worldAssembly,variant,resolvedLayout,error))
         {std::fprintf(stderr,"Resolved-layout snapshot failed: %s\n",error.c_str());return 2;}
+        if(!std::holds_alternative<std::nullptr_t>(ownerJsonRoot.Get("motif_family_override").Data))
+        {
+            std::vector<VoxelForgeCore::ResolvedLayoutStampRequestV1> requests;
+            if(!StandaloneWorldAssemblyPrototype::BuildMotifFamilyRequests(ownerJsonRoot,
+                    *ownerWorld,worldAssembly,resolvedLayout,requests,error)
+                ||!VoxelForgeCore::ResolveResolvedLayoutStampsV3(
+                    resolvedLayout,seed,requests,error))
+            {std::fprintf(stderr,"Native motif family resolution failed: %s\n",error.c_str());return 2;}
+            std::printf("[ResolvedMotifFamily] vocabulary=%u records=%zu placement=seed,strate,stable_id route_keepout=PASS band_clearance=PASS pairwise_spacing=PASS status=PASS\n",
+                resolvedLayout.stampVocabularyVersion,resolvedLayout.stamps.size());
+            for(const auto& motif:resolvedLayout.stamps)
+            {
+                const char* shape=motif.kind==VoxelForgeCore::ResolvedSdfStampKindV1::fillMonolith
+                    ?"rounded_capped_cylinder":"rounded_box_platform";
+                std::printf("[ResolvedMotif] id=%s strate=%d shape=%s position_m=(%.3f,%.3f,%.3f) bounds_m=[%.3f,%.3f]x[%.3f,%.3f]x[%.3f,%.3f] half_extents_m=(%.3f,%.3f,%.3f) fillet_radius_m=%.3f blend_width_m=%.3f minimum_spacing_m=%.3f floor_m=%.3f seed=%llu\n",
+                    motif.stableId.c_str(),motif.strateIndex,shape,
+                    motif.positionMicrometres[0]/1.0e6,motif.positionMicrometres[1]/1.0e6,
+                    motif.positionMicrometres[2]/1.0e6,
+                    motif.boundsMinimumMicrometres[0]/1.0e6,motif.boundsMaximumMicrometres[0]/1.0e6,
+                    motif.boundsMinimumMicrometres[1]/1.0e6,motif.boundsMaximumMicrometres[1]/1.0e6,
+                    motif.boundsMinimumMicrometres[2]/1.0e6,motif.boundsMaximumMicrometres[2]/1.0e6,
+                    motif.halfExtentsMicrometres[0]/1.0e6,motif.halfExtentsMicrometres[1]/1.0e6,
+                    motif.halfExtentsMicrometres[2]/1.0e6,
+                    motif.roundingRadiusMicrometres/1.0e6,motif.smoothWidthMicrometres/1.0e6,
+                    motif.minimumSpacingMicrometres/1.0e6,motif.floorMicrometres/1.0e6,
+                    static_cast<unsigned long long>(motif.irregularitySeed));
+            }
+        }
         if(options.LandmarkChamberDemo)
         {
             std::vector<VoxelForgeCore::ResolvedLayoutStampRequestV1> requests;
@@ -1800,6 +1831,7 @@ int main(int argc,char** argv)
         options.AuditResolvedLayoutPassages,options.AuditStrateTransitions,
         &resolvedLayout,options.StreamHashTiles,options.AuditLandmarkReachability,
         options.AuditOreVeinYield,options.AuditNativeCaves,options.InstrumentTileDrain,
+        options.AuditMotifIntervals,
         options.ExactMidpointDensityMemo,options.ActiveLaneBatching,
         options.ProofBlockCells,options.HasSignEdgeRepairOverride
             ?options.ParallelSignEdgeRepair:options.FloatingIslandsRecipe);