core: cave planner holds for 16 seeds; mouth joints planned from the resolved mouth (L135, v236)

Mouth floor/profile carried into the first/last edges (fixes seeds 1 and 2); fixed a Q16/Q32 scale bug in the mouth
clearance scorer; shortest grade-safe handles; bounded cave AABBs and hoisted edge-BVH normalisation. Seeds 0-15 pass
all composed audits and negative controls; fast tier, Clang/GCC W1/W8/W12 green. Near-ready still +3.9..+13.7% vs
assembler/world (Surface World +3.9..+8.2% with no caves). Not for merge.

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

Standalone/Source/StreamingWorld.h

@@ -1580,10 +1580,13 @@ private:
             static_cast<unsigned long long>(D.islandSharedCacheConflictReplacements),
             static_cast<double>(D.islandSharedCacheLockWaitNanoseconds)/1000.0);
         if(D.passageComposerProfiled)
-            std::printf("[PassageComposerTile] key=(%d,%d,%d,lod%d) worker_ms=%.3f samples=%llu native_field_calls=%llu features=%llu route_candidates=%llu boundary_band_queries=%llu queries=%llu passage_iterations=%llu carve_segment_visits=%llu relief_field_calls=%llu sweep_segments=%llu sweep_pairs=%llu sweep_prepare_ms=%.3f sweep_outside_pairs=%llu sweep_shell_support_skips=%llu sweep_min_updates=%llu sweep_base_samples=%llu sweep_detail_samples=%llu sweep_grid_samples=%llu sweep_no_influence_samples=%llu sweep_lookups=%llu sweep_cache_hits=%llu sweep_base_hits=%llu sweep_outside_hits=%llu sweep_missing=%llu\n",
+            std::printf("[PassageComposerTile] key=(%d,%d,%d,lod%d) worker_ms=%.3f samples=%llu field_calls=%llu native_cave_samples=%llu room_candidates=%llu edge_candidates=%llu features=%llu route_candidates=%llu boundary_band_queries=%llu queries=%llu passage_iterations=%llu carve_segment_visits=%llu relief_field_calls=%llu sweep_segments=%llu sweep_pairs=%llu sweep_prepare_ms=%.3f sweep_outside_pairs=%llu sweep_shell_support_skips=%llu sweep_min_updates=%llu sweep_base_samples=%llu sweep_detail_samples=%llu sweep_grid_samples=%llu sweep_no_influence_samples=%llu sweep_lookups=%llu sweep_cache_hits=%llu sweep_base_hits=%llu sweep_outside_hits=%llu sweep_missing=%llu\n",
                 Event.Key.Coord.X,Event.Key.Coord.Y,Event.Key.Coord.Z,Event.Key.Level,
                 Event.WorkerMilliseconds,static_cast<unsigned long long>(Event.DensitySamples),
                 static_cast<unsigned long long>(D.fieldCalls),
+                static_cast<unsigned long long>(D.nativeCaveFieldSamples),
+                static_cast<unsigned long long>(D.cavernRoomCandidates),
+                static_cast<unsigned long long>(D.cavernEdgeCandidates),
                 static_cast<unsigned long long>(D.passageTileFeatureCount),
                 static_cast<unsigned long long>(D.passageTileRouteSegmentCandidates),
                 static_cast<unsigned long long>(D.resolvedBoundaryBandQueries),