chore(unreal): U2 -- owner's four-generator plan staged; owner_world.json re-exported

Owner re-saved strates 2026-10-26: DA_Strate1 SurfaceWorld, 2 FloatingIslands,
3 TunnelNetwork, 4 VerticalShafts (default params). BuildHost copies and the
enforced SHA-256 tables updated (old U1 set kept in the report); the export
commandlet handles the four-strate plan; Standalone/data/owner_world.json
regenerated (SHA-256 F42F96AD...). One normal BuildHost gate passed (64/64
tiles) but its top-strate window produced 0 triangles, and a missing
NewDataAsset reference warns -- both to check. No measurements this round.
Report: Standalone/Research/WorldAssemblerM3/Unreal2.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Tools/BuildVoxelForgeCoreHost.ps1

@@ -129,10 +129,10 @@ Copy-Item -LiteralPath (Join-Path $PluginRoot 'VoxelForge.uplugin') `
 $hostAssetRoot = Join-Path $HostRoot 'Content\VoxelForge'
 $expectedAssetHashes = @{
     'DA_Settings' = '8ABE8243104980260FECA0A6F4CF4927768E8E568221A6F6A2C2694F6D15D454'
-    'DA_Strate1' = '76063D691D5CE26D2014B587E1972A6724787BE1204E4652CA863BB8D5001BD0'
-    'DA_Strate2' = '02F56A18CED991BAF93DFB2F69438152275E8353B5E279C1CB7DD6E079E352E2'
-    'DA_Strate3' = 'F47437F8D156C608AA06E40C5B76716ED4A19FA0F057688E7FECC04DC976428C'
-    'DA_Strate4' = '7C0DE7D06876035AC7BC4F117B9166AFD77402021843BA4900B470F4B0D0185B'
+    'DA_Strate1' = 'A9CA6CDDD102250A893E379350B1D0F4AAF04C4F7FCA70E0DB46052A067D2CFB'
+    'DA_Strate2' = '8F9A12A3181635149E6F79F192E0DDAF6B6577442EE324071A7749DCC78B9A0C'
+    'DA_Strate3' = '5470D538C3C5E88237463E71BCA9E2EB170DFE3A0543C0F33298D9FB010FD2F9'
+    'DA_Strate4' = 'A98E33E1CD42F374D6CB70F5071E8EBBA74D91ED59D2FD3201782DAB84D28F5C'
 }
 foreach ($assetName in $expectedAssetHashes.Keys) {
     $stagedAsset = Join-Path $hostAssetRoot "$assetName.uasset"
@@ -141,7 +141,7 @@ foreach ($assetName in $expectedAssetHashes.Keys) {
     }
     $stagedHash = (Get-FileHash -LiteralPath $stagedAsset -Algorithm SHA256).Hash
     if ($stagedHash -ne $expectedAssetHashes[$assetName]) {
-        throw "BuildHost owner asset copy differs from the recorded round-4 hash: $assetName"
+        throw "BuildHost owner asset copy differs from the recorded owner-asset hash: $assetName"
     }
 }