fix: add Windows installer and upload Windows CLI binaries to release

- Add install.ps1 PowerShell script for native Windows installation
- Update install.sh to redirect Windows users (MINGW/MSYS/CYGWIN) to install.ps1
- Ignore CLI build artifacts (*.exe, *.zip, *.tar.gz) in .gitignore
- Windows binaries (x86_64 + arm64) uploaded to v0.1.6 release

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -43,3 +43,6 @@ next-env.d.ts
 # CLI build artifacts
 cli/transmute
 cli/*.pdf
+cli/*.exe
+cli/*.zip
+cli/*.tar.gz

install.ps1

@@ -0,0 +1,99 @@
+# Transmute CLI installer for Windows
+# Usage: irm https://raw.githubusercontent.com/noauf/Transmute/main/install.ps1 | iex
+
+$ErrorActionPreference = "Stop"
+
+$REPO = "noauf/Transmute"
+$BINARY = "transmute"
+
+Write-Host ""
+Write-Host "  Transmute CLI installer"
+Write-Host "  ======================"
+Write-Host ""
+
+# Detect architecture
+$ARCH = if ([System.Environment]::Is64BitOperatingSystem) {
+    if ($env:PROCESSOR_ARCHITECTURE -eq "ARM64") { "arm64" } else { "x86_64" }
+} else {
+    Write-Host "  Error: 32-bit Windows is not supported" -ForegroundColor Red
+    exit 1
+}
+
+Write-Host "  OS:   windows"
+Write-Host "  Arch: $ARCH"
+Write-Host ""
+
+$ASSET = "$BINARY-windows-$ARCH.zip"
+
+# Get latest release tag
+Write-Host "  Fetching latest release..."
+try {
+    $release = Invoke-RestMethod -Uri "https://api.github.com/repos/$REPO/releases/latest" -Headers @{ "User-Agent" = "transmute-installer" }
+    $TAG = $release.tag_name
+} catch {
+    Write-Host "  Error: could not fetch latest release: $_" -ForegroundColor Red
+    exit 1
+}
+
+if (-not $TAG) {
+    Write-Host "  Error: could not determine latest release" -ForegroundColor Red
+    exit 1
+}
+
+Write-Host "  Latest version: $TAG"
+
+$DOWNLOAD_URL = "https://github.com/$REPO/releases/download/$TAG/$ASSET"
+
+# Create temp directory
+$TMP_DIR = Join-Path $env:TEMP "transmute-install-$(Get-Random)"
+New-Item -ItemType Directory -Path $TMP_DIR | Out-Null
+
+try {
+    $ZIP_PATH = Join-Path $TMP_DIR $ASSET
+
+    Write-Host "  Downloading $ASSET..."
+    Invoke-WebRequest -Uri $DOWNLOAD_URL -OutFile $ZIP_PATH -UseBasicParsing
+
+    Write-Host "  Extracting..."
+    Expand-Archive -Path $ZIP_PATH -DestinationPath $TMP_DIR -Force
+
+    $EXE_NAME = "$BINARY.exe"
+    $EXE_SOURCE = Join-Path $TMP_DIR "$BINARY-windows-$ARCH.exe"
+    if (-not (Test-Path $EXE_SOURCE)) {
+        $EXE_SOURCE = Join-Path $TMP_DIR $EXE_NAME
+    }
+
+    if (-not (Test-Path $EXE_SOURCE)) {
+        Write-Host "  Error: could not find $EXE_NAME in archive" -ForegroundColor Red
+        exit 1
+    }
+
+    # Determine install directory
+    $INSTALL_DIR = "$env:LOCALAPPDATA\transmute\bin"
+    New-Item -ItemType Directory -Path $INSTALL_DIR -Force | Out-Null
+
+    $INSTALL_PATH = Join-Path $INSTALL_DIR $EXE_NAME
+    Copy-Item -Path $EXE_SOURCE -Destination $INSTALL_PATH -Force
+
+    Write-Host ""
+    Write-Host "  Installed transmute $TAG to $INSTALL_PATH"
+    Write-Host ""
+
+    # Add to PATH if not already there
+    $USER_PATH = [System.Environment]::GetEnvironmentVariable("PATH", "User")
+    if ($USER_PATH -notlike "*$INSTALL_DIR*") {
+        [System.Environment]::SetEnvironmentVariable("PATH", "$USER_PATH;$INSTALL_DIR", "User")
+        Write-Host "  Added $INSTALL_DIR to your PATH."
+        Write-Host "  Restart your terminal for the PATH change to take effect."
+        Write-Host ""
+    }
+
+    Write-Host "  Get started:"
+    Write-Host "    transmute *.png          Convert all PNGs"
+    Write-Host "    transmute ./photos/      Convert all files in a directory"
+    Write-Host "    transmute --help         Show all options"
+    Write-Host ""
+
+} finally {
+    Remove-Item -Recurse -Force $TMP_DIR -ErrorAction SilentlyContinue
+}

install.sh

@@ -11,7 +11,15 @@ OS="$(uname -s)"
 case "$OS" in
   Darwin)  OS="darwin" ;;
   Linux)   OS="linux" ;;
-  MINGW*|MSYS*|CYGWIN*) OS="windows" ;;
+  MINGW*|MSYS*|CYGWIN*)
+    echo ""
+    echo "  Windows detected."
+    echo "  Please use the PowerShell installer instead:"
+    echo ""
+    echo "    irm https://raw.githubusercontent.com/noauf/Transmute/main/install.ps1 | iex"
+    echo ""
+    exit 0
+    ;;
   *)
     echo "Error: unsupported operating system: $OS"
     exit 1