fix(installer): stop existing daemon when installing to a new directory

install.ps1

@@ -132,18 +132,19 @@ function Install-Binary {
     $staged = "$Target.install-$([Guid]::NewGuid().ToString('N'))"
     try {
         [System.IO.File]::Copy($Source, $staged)
+        # The running daemon may come from another installation directory.
+        # Use the downloaded CLI: older versions have broken Windows liveness checks.
+        # Stop verifies daemon identity and uses the current BSK_HOME.
+        & $Source daemon stop
+        if ($LASTEXITCODE -ne 0) { throw "could not stop bsk daemon; installation was not changed" }
         if ([System.IO.File]::Exists($Target)) {
-            # Use the downloaded CLI: older versions have broken Windows
-            # liveness checks. Stop verifies daemon identity before terminating it.
-            & $Source daemon stop
-            if ($LASTEXITCODE -ne 0) { throw "could not stop bsk daemon; existing installation was not replaced" }
             # PowerShell 5.1 converts $null to an empty path for string parameters.
             [System.IO.File]::Replace($staged, $Target, [NullString]::Value)
-            Write-Log "daemon will restart automatically on the next browser command"
         }
         else {
             [System.IO.File]::Move($staged, $Target)
         }
+        Write-Log "daemon will restart automatically on the next browser command"
     }
     finally {
         if ([System.IO.File]::Exists($staged)) { [System.IO.File]::Delete($staged) }

scripts/install-windows.test.ps1

@@ -143,11 +143,36 @@ try {
     & $target --version
     if ($LASTEXITCODE -ne 0) { throw "replacement is not executable" }
 
+    # Installing into a new directory must also stop a daemon from the old one.
+    $newTargetDir = Join-Path $root "new install"
+    [IO.Directory]::CreateDirectory($newTargetDir) | Out-Null
+    $newTarget = Join-Path $newTargetDir "bsk.exe"
+    $before = (Get-FileHash -LiteralPath $target).Hash
+    $daemon = Start-Process -FilePath $target -ArgumentList @('daemon', 'start', '--foreground', '--port', '0') -WindowStyle Hidden -PassThru
+    $deadline = [DateTime]::UtcNow.AddSeconds(15)
+    while (-not [IO.File]::Exists($infoPath)) {
+        if ($daemon.HasExited -or [DateTime]::UtcNow -gt $deadline) { throw "old-directory daemon failed to start" }
+        Start-Sleep -Milliseconds 50
+    }
+    Install-Binary $source $newTarget
+    if (-not $daemon.WaitForExit(5000)) { throw "new-directory install left the old daemon running" }
+    Assert-Equal (Get-FileHash -LiteralPath $target).Hash $before
+    Assert-Equal (Get-FileHash -LiteralPath $newTarget).Hash (Get-FileHash -LiteralPath $source).Hash
+    & $newTarget --version
+    if ($LASTEXITCODE -ne 0) { throw "new-directory installation is not executable" }
+    if (@(Get-ChildItem -LiteralPath $newTargetDir -Filter "*.install-*").Count) { throw "new-directory staging files leaked" }
+
     # Refuse replacement when daemon identity cannot be verified.
     [IO.File]::WriteAllText($infoPath, 'invalid daemon metadata')
     $before = (Get-FileHash -LiteralPath $target).Hash
     Assert-Fails { Install-Binary $source $target }
     Assert-Equal (Get-FileHash -LiteralPath $target).Hash $before
+
+    # A failed stop must also prevent installation to a previously empty target.
+    $blockedTarget = Join-Path $newTargetDir "blocked.exe"
+    Assert-Fails { Install-Binary $source $blockedTarget }
+    if (Test-Path -LiteralPath $blockedTarget) { throw "failed stop created an installation" }
+    if (@(Get-ChildItem -LiteralPath $newTargetDir -Filter "*.install-*").Count) { throw "failed stop leaked staging files" }
     [IO.File]::Delete($infoPath)
 
     # A remaining lock must fail without truncation or staging debris.