fix: suppress uv venv output on Windows quiet install and use correct env var syntax in completion message

Author: codemedic

install.ps1

@@ -85,7 +85,9 @@ if (Test-Path $VenvPy) {
     Write-Msg "  ✓ venv already exists"
 } else {
     Write-Msg "  → Creating Python $MinPython venv"
-    & $UvExe venv --python $MinPython (Join-Path $Prefix "venv")
+    $venvArgs = @("venv", "--python", $MinPython)
+    if ($Quiet) { $venvArgs += "--quiet" }
+    & $UvExe @venvArgs (Join-Path $Prefix "venv")
     if ($LASTEXITCODE -ne 0) {
         Write-Error "Failed to create Python $MinPython venv — see uv error above"
         exit $LASTEXITCODE

setup.py

@@ -315,8 +315,12 @@ def main() -> None:
         else:
             print(f'  source "{prefix / "env.sh"}"')
         print()
-        print(f'  Then:  "${args.python_env}" /path/to/script.py')
-        print(f'         "${args.uv_env}" run --project /path/to/app script.py')
+        if _IS_WINDOWS:
+            print(f'  Then:  $env:{args.python_env} /path/to/script.py')
+            print(f'         $env:{args.uv_env} run --project /path/to/app script.py')
+        else:
+            print(f'  Then:  "${args.python_env}" /path/to/script.py')
+            print(f'         "${args.uv_env}" run --project /path/to/app script.py')
         print()