fix: clean interrupted staging temporaries

tests/test_transfer.py

@@ -11,6 +11,7 @@ from archive_clients.transfer import (
     FileMaterializer,
     TransferIntegrityError,
     canonical_message_json,
+    cleanup_partial_transfer,
     load_published_transfer,
     materialize_transfer,
     stage_transfer,
@@ -206,6 +207,33 @@ class TransferHappyPathTests(unittest.TestCase):
             os.stat(copied).st_blocks * 512, os.stat(copied).st_size
         )
 
+    def test_partial_cleanup_removes_only_journalled_temporary(self):
+        job_id = str(uuid4())
+        job_root = self.sync / ".archive-control/jobs" / job_id
+        destination = job_root / "payload/album/one.bin"
+        destination.parent.mkdir(parents=True)
+        operation_id = "interrupted-copy"
+        self.store.begin_file_operation(
+            operation_id,
+            job_id,
+            '{"destination":"payload/album/one.bin"}',
+        )
+        temporary = destination.with_name(
+            ".one.bin.archive-control-"
+            + hashlib.sha256(operation_id.encode()).hexdigest()[:16]
+            + ".tmp"
+        )
+        temporary.write_bytes(b"partial")
+        unrelated = destination.parent / "keep-me"
+        unrelated.write_bytes(b"unrelated")
+
+        cleanup_partial_transfer(
+            job_root, job_id=job_id, store=self.store
+        )
+
+        self.assertFalse(temporary.exists())
+        self.assertTrue(unrelated.is_file())
+
     def test_canonical_manifest_json_is_stable(self):
         manifest = self._manifest()
         first = canonical_message_json(manifest)