wip(standalone): shape-world join blends (room 12, strata/cave 3) -- source restored to last passing set, not rebuilt

Luna's continuation stopped when Windows could not start new processes (0xC0000142, low memory).
Fixed-view join step: chamber 0.041, tunnel 0.434 (bar 0.450, barely). Routes 5642/5642 open.
Shape stages 0.963 s / 0.870 s. Floor join plates still visible; final checks not run.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MmSoF64BbRFmk9C3p1VsBJ

Standalone/Research/OwnerShapeWorld/round2/RunLimited.ps1

@@ -0,0 +1,48 @@
+[CmdletBinding()]
+param(
+    [Parameter(Mandatory=$true)][string]$ExecutableName,
+    [Parameter(Mandatory=$true)][string[]]$ExecutableArguments,
+    [Parameter(Mandatory=$true)][string]$LogStem,
+    [double]$MemoryLimitGB = 6.0
+)
+
+$ErrorActionPreference = 'Stop'
+$RoundDir = [IO.Path]::GetFullPath($PSScriptRoot)
+$StandaloneRoot = [IO.Path]::GetFullPath((Join-Path $PSScriptRoot '..\..\..'))
+if ([IO.Path]::GetFileName($ExecutableName) -ne $ExecutableName) { throw 'ExecutableName must be a filename.' }
+if ([IO.Path]::GetFileName($LogStem) -ne $LogStem) { throw 'LogStem must be a filename stem.' }
+$ExecutablePath = Join-Path (Join-Path $StandaloneRoot 'bin') $ExecutableName
+if (-not (Test-Path -LiteralPath $ExecutablePath -PathType Leaf)) { throw "Executable not found: $ExecutablePath" }
+$StdoutPath = Join-Path $RoundDir ($LogStem + '.stdout.log')
+$StderrPath = Join-Path $RoundDir ($LogStem + '.stderr.log')
+
+$HostProcess = Get-Process -Id $PID
+$HostProcess.PriorityClass = 'BelowNormal'
+$HostProcess.ProcessorAffinity = [IntPtr]0xFF00
+
+$Child = Start-Process -FilePath $ExecutablePath -ArgumentList $ExecutableArguments `
+    -WorkingDirectory $StandaloneRoot -WindowStyle Hidden -PassThru `
+    -RedirectStandardOutput $StdoutPath -RedirectStandardError $StderrPath
+$KilledForMemory = $false
+$PeakWorkingSet = 0L
+while (-not $Child.HasExited) {
+    $Child.Refresh()
+    if ($Child.HasExited) { break }
+    $Child.PriorityClass = 'BelowNormal'
+    $Child.ProcessorAffinity = [IntPtr]0xFF00
+    $PeakWorkingSet = [Math]::Max($PeakWorkingSet,$Child.WorkingSet64)
+    if ($Child.WorkingSet64 -gt $MemoryLimitGB * 1GB) {
+        $KilledForMemory = $true
+        Stop-Process -Id $Child.Id -Force
+        break
+    }
+    Start-Sleep -Milliseconds 500
+}
+$Child.WaitForExit()
+$Child.Refresh()
+if ($KilledForMemory) {
+    Write-Output "ABORTED_MEMORY_LIMIT pid=$($Child.Id) peak_observed_gb=$([math]::Round($PeakWorkingSet/1GB,2)) limit_gb=$MemoryLimitGB"
+    exit 98
+}
+Write-Output "RUN_EXIT pid=$($Child.Id) priority=BelowNormal affinity=0xFF00 peak_observed_gb=$([math]::Round($PeakWorkingSet/1GB,2)) exit_code=$($Child.ExitCode)"
+exit $Child.ExitCode