fix(marketplace): Publish plugin sync atomically

tools/scripts/tests/test_editorial_bundles.py

@@ -2,6 +2,7 @@ import importlib.util
 import errno
 import pathlib
 import sys
+import tempfile
 from unittest import mock
 import unittest
 
@@ -160,6 +161,31 @@ class EditorialBundlesTests(unittest.TestCase):
         self.assertEqual(calls["count"], 2)
         sleep_mock.assert_called_once()
 
+    def test_replace_directory_atomically_swaps_only_after_staging_is_ready(self):
+        with tempfile.TemporaryDirectory() as temp_dir:
+            temp_root = pathlib.Path(temp_dir)
+            destination = temp_root / "plugin"
+            old_file = destination / "skills" / "old.txt"
+            old_file.parent.mkdir(parents=True, exist_ok=True)
+            old_file.write_text("old", encoding="utf-8")
+
+            observed = {}
+
+            def populate(staging_root):
+                new_file = staging_root / "skills" / "new.txt"
+                new_file.parent.mkdir(parents=True, exist_ok=True)
+                new_file.write_text("new", encoding="utf-8")
+
+                observed["old_visible_during_populate"] = old_file.is_file()
+                observed["new_hidden_during_populate"] = not (destination / "skills" / "new.txt").exists()
+
+            editorial_bundles._replace_directory_atomically(destination, populate)
+
+            self.assertTrue(observed["old_visible_during_populate"])
+            self.assertTrue(observed["new_hidden_during_populate"])
+            self.assertFalse(old_file.exists())
+            self.assertTrue((destination / "skills" / "new.txt").is_file())
+
 
 if __name__ == "__main__":
     unittest.main()