fix: point the retrobat guide at install.ps1

scripts/packreadme.py

@@ -140,8 +140,8 @@ def _build_readme(
             "INSTALLATION GUIDE (Windows)\n\n"
             "  Option A: Automatic (recommended)\n"
             "  ---------------------------------\n"
-            "  Download and run install.bat from:\n"
-            "  https://github.com/Abdess/retrobios/releases\n\n"
+            "  Open PowerShell and run:\n\n"
+            "    irm https://raw.githubusercontent.com/Abdess/retrobios/main/install.ps1 | iex\n\n"
             "  Option B: Manual\n"
             "  ----------------\n"
             "  1. Open your RetroBat installation folder\n"

tests/test_pack_readme.py

@@ -46,5 +46,15 @@ class GuidesPointAtTheReadPath(unittest.TestCase):
                 )
 
 
+class GuidesNameShippedInstallers(unittest.TestCase):
+    def test_every_installer_named_exists(self):
+        """RetroBat's guide sent users to an install.bat no release carries."""
+        import re
+
+        source = (REPO_ROOT / "scripts" / "packreadme.py").read_text(encoding="utf-8")
+        for name in set(re.findall(r"install\.(?:bat|ps1|sh|py)", source)):
+            with self.subTest(installer=name):
+                self.assertTrue((REPO_ROOT / name).is_file())
+
 if __name__ == "__main__":
     unittest.main()