tools: open real offline frmP2PChat window

scripts/test-open-offline-real-frmP2PChat-contract.ps1

@@ -0,0 +1,49 @@
+param(
+    [string]$ScriptPath = "scripts/open-offline-real-frmP2PChat.ps1"
+)
+
+$ErrorActionPreference = "Stop"
+$repo = Resolve-Path -LiteralPath (Join-Path $PSScriptRoot "..")
+$target = if ([System.IO.Path]::IsPathRooted($ScriptPath)) {
+    $ScriptPath
+}
+else {
+    Join-Path $repo $ScriptPath
+}
+
+if (-not (Test-Path -LiteralPath $target)) {
+    throw "script not found: $target"
+}
+
+$text = Get-Content -LiteralPath $target -Raw
+$requiredPatterns = @(
+    @{ Name = "x86 PowerShell guard"; Pattern = "Environment]::Is64BitProcess" },
+    @{ Name = "AssemblyResolve dependency loader"; Pattern = "AssemblyResolve" },
+    @{ Name = "fake runtime mode parameter"; Pattern = "RuntimeMode" },
+    @{ Name = "self chat variant"; Pattern = "SelfChat" },
+    @{ Name = "skip roster variant"; Pattern = "SkipRosterManager" },
+    @{ Name = "CLR IL offset extraction"; Pattern = "GetILOffset" },
+    @{ Name = "IL offset JSON field"; Pattern = "il_offset_hex" },
+    @{ Name = "Config.BaseConfig fake runtime"; Pattern = "<BaseConfig>k__BackingField" },
+    @{ Name = "remote control config key"; Pattern = "Remote_Control_Visible" },
+    @{ Name = "fake frmMain activation target"; Pattern = "<frmMain>k__BackingField" },
+    @{ Name = "UserInfo cache warmup"; Pattern = "UserInfoCache" },
+    @{ Name = "result artifact output"; Pattern = "real-frmP2PChat-result" }
+)
+
+$missing = @()
+foreach ($item in $requiredPatterns) {
+    if ($text -notmatch $item.Pattern) {
+        $missing += $item.Name
+    }
+}
+
+if ($missing.Count -gt 0) {
+    throw "contract missing: $($missing -join ', ')"
+}
+
+[pscustomobject]@{
+    ok = $true
+    script = $target
+    checked = $requiredPatterns.Count
+} | ConvertTo-Json -Compress