fix: remove http delete-kinds regression

harness/tests/test_vector_port_contract.py

@@ -35,6 +35,7 @@ def test_http_store_supports_writer_without_reader():
     assert store.capabilities.search is False
     assert store.capabilities.existing_hashes is True
     assert store.capabilities.upsert is True
+    assert hasattr(store, "delete_kinds") is False
     with pytest.raises(VectorReadUnavailable):
         store.search(["memory"], [0.1], limit=1)