fix(net): honor retail graceful logout handshake

Send the active character id, drain until the authoritative server confirmation, then emit retail's zero-sequence connection disconnect with the negotiated receiver iteration. The connected gate now waits for ACE to remove the exact UDP session before reconnecting, eliminating fixed-delay races.

tools/run-connected-world-lifecycle-gate.ps1

@@ -3,6 +3,7 @@ param(
     [string]$Repository = (Resolve-Path (Join-Path $PSScriptRoot '..')).Path,
     [string]$Account = $env:ACDREAM_TEST_USER,
     [string]$Password = $env:ACDREAM_TEST_PASS,
+    [string]$AceLogPath = 'C:\ACE\Server\ACE_Log.txt',
     [switch]$SkipBuild,
     [int]$SessionTimeoutSeconds = 420
 )
@@ -47,11 +48,44 @@ function Wait-ForPattern(
     throw "timed out after $TimeoutSeconds seconds waiting for '$Pattern'"
 }
 
+function Wait-ForFileAppendPattern(
+    [string]$Path,
+    [long]$StartOffset,
+    [string]$Pattern,
+    [int]$TimeoutSeconds)
+{
+    $deadline = [DateTime]::UtcNow.AddSeconds($TimeoutSeconds)
+    while ([DateTime]::UtcNow -lt $deadline) {
+        if (Test-Path -LiteralPath $Path) {
+            $stream = [System.IO.File]::Open(
+                $Path,
+                [System.IO.FileMode]::Open,
+                [System.IO.FileAccess]::Read,
+                [System.IO.FileShare]::ReadWrite)
+            try {
+                if ($stream.Length -gt $StartOffset) {
+                    $null = $stream.Seek($StartOffset, [System.IO.SeekOrigin]::Begin)
+                    $reader = [System.IO.StreamReader]::new($stream)
+                    try { $appended = $reader.ReadToEnd() }
+                    finally { $reader.Dispose() }
+                    if ([Text.RegularExpressions.Regex]::IsMatch(
+                        $appended,
+                        $Pattern,
+                        [Text.RegularExpressions.RegexOptions]::CultureInvariant)) { return }
+                }
+            }
+            finally { $stream.Dispose() }
+        }
+        Start-Sleep -Milliseconds 100
+    }
+    throw "timed out after $TimeoutSeconds seconds waiting for ACE log '$Pattern'"
+}
+
 function Close-ClientGracefully([Diagnostics.Process]$Client) {
     $Client.Refresh()
     if ($Client.HasExited) { return $true }
     if (-not $Client.CloseMainWindow()) { return $false }
-    if (-not $Client.WaitForExit(30000)) { return $false }
+    if (-not $Client.WaitForExit(45000)) { return $false }
     $Client.WaitForExit()
     return $true
 }
@@ -79,7 +113,10 @@ function Add-LogFailures([string]$Label, [string]$Stdout, [string]$Stderr) {
         'device removed',
         'GPU reset',
         'live: disconnected',
-        'screenshot-failed'
+        'screenshot-failed',
+        'graceful logout confirmation timed out',
+        'graceful logout failed',
+        'transport disconnect failed'
     )
     foreach ($pattern in $fatalPatterns) {
         $count = (Get-PatternCount $Stdout $pattern) + (Get-PatternCount $Stderr $pattern)
@@ -155,9 +192,11 @@ function Invoke-Session(
     $stderr = Join-Path $sessionDir 'stderr.log'
     $timeline = Join-Path $artifactDir 'world-lifecycle.checkpoints.jsonl'
     $client = $null
+    $clientPort = $null
     $graceful = $false
     $exitCode = $null
     $elapsed = [Diagnostics.Stopwatch]::StartNew()
+    $aceLogOffset = (Get-Item -LiteralPath $AceLogPath).Length
 
     $env:ACDREAM_DAT_DIR = "$env:USERPROFILE\Documents\Asheron's Call"
     $env:ACDREAM_LIVE = '1'
@@ -180,6 +219,12 @@ function Invoke-Session(
             -RedirectStandardOutput $stdout -RedirectStandardError $stderr -PassThru
         Wait-ForPattern $client $stdout '[UI-PROBE] UI probe script complete' $SessionTimeoutSeconds
 
+        $clientPort = @(Get-NetUDPEndpoint -OwningProcess $client.Id -ErrorAction SilentlyContinue |
+            Select-Object -First 1 -ExpandProperty LocalPort)
+        if ($clientPort.Count -ne 1) {
+            throw "could not resolve the client's UDP endpoint for ACE disconnect verification"
+        }
+
         $client.Refresh()
         $processSample = [pscustomobject][ordered]@{
             WorkingSetMiB = [Math]::Round($client.WorkingSet64 / 1MB, 1)
@@ -206,7 +251,6 @@ function Invoke-Session(
             if (-not (Test-Png $png)) { $failures.Add("${Label}: missing or invalid screenshot '$png'") }
         }
 
-        Add-LogFailures $Label $stdout $stderr
         $graceful = Close-ClientGracefully $client
         $client.Refresh()
         if ($client.HasExited) { $exitCode = [int]$client.ExitCode }
@@ -214,6 +258,15 @@ function Invoke-Session(
         if ($null -ne $exitCode -and $exitCode -ne 0) {
             $failures.Add("${Label}: client exited with code $exitCode")
         }
+        Add-LogFailures $Label $stdout $stderr
+        if ((Get-PatternCount $stdout '[session] graceful logout confirmed') -ne 1) {
+            $failures.Add("${Label}: server did not authoritatively confirm graceful character logout")
+        }
+        Wait-ForFileAppendPattern `
+            $AceLogPath `
+            $aceLogOffset `
+            "Session .*\\127\.0\.0\.1:$clientPort dropped\..*Reason: PacketHeader Disconnect" `
+            15
 
         $session = [pscustomobject][ordered]@{
             Label = $Label
@@ -281,6 +334,9 @@ if (@(Get-Process -Name AcDream.App -ErrorAction SilentlyContinue).Count -gt 0)
 if (@(Get-NetUDPEndpoint -LocalPort 9000 -ErrorAction SilentlyContinue).Count -eq 0) {
     throw 'local ACE is not listening on UDP port 9000'
 }
+if (-not (Test-Path -LiteralPath $AceLogPath)) {
+    throw "ACE log was not found: $AceLogPath"
+}
 
 if (-not $SkipBuild) {
     & dotnet build (Join-Path $Repository 'AcDream.slnx') -c Release --no-restore
@@ -297,10 +353,9 @@ $capped = Invoke-Session `
 
 Add-SameLocationGates $capped
 
-# The second process is both the session-teardown/reconnect gate and the
-# uncapped renderer sample. A short pause lets ACE finish releasing the first
-# session before the same account logs in again.
-Start-Sleep -Seconds 3
+# The second process starts as soon as ACE records accepting the first
+# process's transport Disconnect. No elapsed-time settle delay hides a
+# shutdown race.
 $null = Invoke-Session `
     'uncapped-reconnect' `
     (Join-Path $Repository 'tools\connected-world-reconnect.route.txt') `