feat: proper windows support

tests/ci_test/verify_native_wrapper_shape.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+python3 - "$@" <<'PY'
+import pathlib
+import sys
+
+windows = sys.platform.startswith("win")
+
+for launcher in sys.argv[1:]:
+    suffix = pathlib.Path(launcher).suffix.lower()
+    if windows:
+        if suffix != ".cmd":
+            raise SystemExit(f"expected .cmd launcher on Windows: {launcher}")
+    elif suffix == ".sh":
+        raise SystemExit(f"unexpected .sh launcher executable: {launcher}")
+PY