docs+cleanup: CURRENT-STATE.md and dead L86/L88 ablation switches removed (L131)

One current-state page (shipping behaviour, references with sources, gaps, verification, closed lines), linked from
CLAUDE.md. Removes the L86/L88 passage/boundary ablation switches and the unused legacy route-grade audit; inventory
of every kept switch in the report. Output identical: 24/24 + 18/18 hashes, fast tier, walk/seam audits, UE host
build; timing unchanged (-0.2%, CI spans 0). No Source/ changes.

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

Standalone/Source/StreamBenchmarkPipeline.h

@@ -2566,15 +2566,9 @@ namespace StandaloneStreamBenchmark
         ShapeRequest.detail=DetailVariant;ShapeRequest.includeFarWorld=bIncludeFarWorld&&!bDeferFarWorld;
         ShapeRequest.roundTunnels=bRoundTunnels;
         ShapeRequest.enhancedTunnelWalls=bEnhancedTunnelWalls;
-        const char* L86DisablePassages=std::getenv(
-            "VOXELFORGE_L86_DISABLE_PASSAGE_COMPOSITION");
-        const bool bL86DisablePassages=L86DisablePassages
-            &&L86DisablePassages[0]=='1'&&L86DisablePassages[1]=='\0';
-        ShapeRequest.validatePassageRoutes=!bCaptureSkipWalkability&&!bL86DisablePassages;
+        ShapeRequest.validatePassageRoutes=!bCaptureSkipWalkability;
         if(bCaptureSkipWalkability)
             std::printf("[CaptureWalkabilityGate] validation=deferred geometry_input=unchanged mode=mesh-export\n");
-        if(bL86DisablePassages)
-            std::printf("[L86PassageCeiling] validation=skipped geometry=passage_composition_disabled diagnostic_only=true\n");
         FStandaloneStreamingGenerator Streamer(World,WorkerCount,bHashDensity,nullptr,MaxLevel,
             bSkipUvAndColors,bSkipMaterialGroups,bSkipUV,bSkipColors,&Shape,bProfileColumnOverlap,
             FarHorizonLOD8InteriorStepVoxels,bUseSharedColumnCache,