fix: correct Windows drive letter casing and platform error message

.github/workflows/smoke-test.yml

@@ -66,6 +66,7 @@ jobs:
         shell: pwsh
         env:
           ARCHGATE_VERSION: ${{ vars.LATEST_RELEASE_TAG || '' }}
+          GH_TOKEN: ${{ github.token }}
         run: |
           # Resolve version: use ARCHGATE_VERSION if set, otherwise query GitHub
           if (-not $env:ARCHGATE_VERSION) {
@@ -117,6 +118,7 @@ jobs:
       - name: Smoke test install.sh
         env:
           ARCHGATE_VERSION: ${{ vars.LATEST_RELEASE_TAG || '' }}
+          GH_TOKEN: ${{ github.token }}
         run: |
           # Resolve version: use ARCHGATE_VERSION if set, otherwise query GitHub
           if [ -z "$ARCHGATE_VERSION" ]; then

install.ps1

@@ -103,8 +103,11 @@ foreach ($f in @("$HOME\.bashrc", "$HOME\.bash_profile", "$HOME\.profile")) {
     }
 }
 
-$InstallDirPosix = $InstallDir -replace '\\', '/' -replace '^([A-Za-z]):', '/$1'
-$PathLine = "export PATH=`"$InstallDirPosix:`$PATH`""
+$InstallDirPosix = $InstallDir -replace '\\', '/'
+if ($InstallDirPosix -match '^([A-Za-z]):') {
+    $InstallDirPosix = '/' + $Matches[1].ToLower() + $InstallDirPosix.Substring(2)
+}
+$PathLine = "export PATH=`"${InstallDirPosix}:`$PATH`""
 
 $NeedsUpdate = @()
 foreach ($f in $GitBashProfiles) {

install.sh

@@ -28,7 +28,7 @@ detect_platform() {
     x86_64|amd64)  arch="x64" ;;
     *)
       echo "Error: unsupported architecture: $arch" >&2
-      echo "archgate supports arm64 (macOS) and x64 (Linux)." >&2
+      echo "archgate supports arm64 (macOS) and x64 (Linux, Windows)." >&2
       exit 1
       ;;
   esac
@@ -253,14 +253,16 @@ setup_path() {
   done
   echo ""
 
-  # Prompt requires /dev/tty — available even when stdin is piped (curl | sh)
-  if [ ! -r /dev/tty ]; then
-    echo "No readable TTY available. To add archgate to your PATH manually, add the lines above to your shell profile."
+  # Prompt requires /dev/tty — available even when stdin is piped (curl | sh).
+  # Use a subshell to test the actual open, because -r may pass on CI runners
+  # that have /dev/tty present but no controlling terminal.
+  if ! (exec </dev/tty) 2>/dev/null; then
+    echo "No TTY available. To add archgate to your PATH manually, add the lines above to your shell profile."
     return
   fi
 
   printf "Update these files now? [Y/n] "
-  if ! read -r answer </dev/tty; then
+  if ! read -r answer </dev/tty 2>/dev/null; then
     echo ""
     echo "Could not read from terminal. To add archgate to your PATH manually, add the lines above to your shell profile."
     return