Implement autostart functionality, ZIP packaging, and related installation scripts; update documentation and tests

Packaging/Test-Package.ps1

@@ -0,0 +1,24 @@
+$ErrorActionPreference = 'Stop'
+$project = Split-Path $PSScriptRoot -Parent
+$package = Join-Path $project 'dist\MusicBridge-win-x64'
+$testRoot = [IO.Path]::GetFullPath((Join-Path $project ('dist\install-smoke-' + [guid]::NewGuid().ToString('N'))))
+$allowed = [IO.Path]::GetFullPath((Join-Path $project 'dist')) + '\'
+if (!$testRoot.StartsWith($allowed, [StringComparison]::OrdinalIgnoreCase)) { throw 'Unsafe test path.' }
+& (Join-Path $package 'Install.ps1') -InstallDirectory $testRoot -NoShortcut
+$exe = Join-Path $testRoot 'MusicBridge.Agent.exe'
+if (!(Test-Path -LiteralPath (Join-Path $testRoot 'coreclr.dll'))) { throw 'Self-contained runtime is missing.' }
+$config = Get-Content -LiteralPath (Join-Path $testRoot 'MusicBridge.Agent.runtimeconfig.json') -Raw | ConvertFrom-Json
+if (!$config.runtimeOptions.includedFrameworks) { throw 'Package unexpectedly depends on globally installed runtimes.' }
+& $exe --help
+if ($LASTEXITCODE -ne 0) { throw 'Installed executable failed to start.' }
+& (Join-Path $package 'Install.ps1') -InstallDirectory $testRoot -NoShortcut
+$probe = [IO.File]::Open($exe, 'Open', 'Read', 'None')
+try {
+    $blocked = $false
+    try { & (Join-Path $package 'Install.ps1') -InstallDirectory $testRoot -NoShortcut }
+    catch { $blocked = $true }
+    if (!$blocked) { throw 'Installer did not reject locked executable.' }
+} finally { $probe.Dispose() }
+& (Join-Path $testRoot 'Uninstall.ps1')
+if (Test-Path -LiteralPath $testRoot) { throw 'Uninstall did not remove test directory.' }
+Write-Host 'PASS: install, self-contained launch, update, locked-file protection, uninstall.'