fix: rojo died on SSH exit - launch via Task Scheduler, not Start-Process

Root cause: Windows OpenSSH kills the whole process tree when the SSH
session exits, so rojo started over SSH died seconds later. Proven:
1 proc inside the session, 0 from a fresh session.

Guard now calls 'schtasks /Run /TN RojoTWR' instead of Start-Process.
Verified unattended: killed rojo, scheduler restored it (Last Result: 0).

tools/win/rojo-guard.ps1

@@ -0,0 +1,38 @@
+# rojo-guard.ps1 -- keep Rojo alive for Tokyo Wangan Racing.
+# Idempotent: starts Rojo only if it is not already listening on 34872.
+# Safe to run every few minutes from Task Scheduler.
+
+$ErrorActionPreference = "SilentlyContinue"
+$repo = Join-Path $env:USERPROFILE "roblox\tokyo-wangan-racing"
+$exe  = Join-Path $env:USERPROFILE ".local\bin\rojo.exe"
+$port = 34872
+$log  = Join-Path $env:USERPROFILE "rojo-guard.log"
+
+function Log($m) { "$(Get-Date -f 'yyyy-MM-dd HH:mm:ss')  $m" | Add-Content $log }
+
+# Is something already LISTENING on the port?
+$listening = netstat -ano | Select-String ":$port\s.*LISTENING"
+
+if ($listening) {
+    $ownerPid = ($listening[0] -split "\s+")[-1]
+    $owner    = (Get-Process -Id $ownerPid).ProcessName
+    if ($owner -eq "rojo") { exit 0 }          # healthy, nothing to do
+    Log "PORT HIJACKED by '$owner' (pid $ownerPid) -- not starting. Kill it first."
+    exit 1                                      # sshd tunnel or similar: do NOT mask it
+}
+
+# Dependencies must exist or rojo exits instantly.
+if (-not (Test-Path (Join-Path $repo "ServerPackages"))) {
+    Log "ServerPackages MISSING -- rojo would exit on startup. Run 'wally install'."
+    exit 1
+}
+
+# Launch DETACHED via Task Scheduler.
+# Do NOT use Start-Process here: if this script is ever invoked over SSH,
+# Windows OpenSSH kills the whole process tree on session exit and rojo dies
+# seconds later. schtasks hands ownership to the scheduler, which survives.
+schtasks /Run /TN "RojoTWR" | Out-Null
+Start-Sleep -Seconds 4
+
+if (Get-Process rojo -EA SilentlyContinue) { Log "started rojo on $port" }
+else { Log "FAILED to start rojo" }