Remove dead code and wire the two-worker smoke script

scimesh/sdk/artifacts.py

@@ -8,7 +8,7 @@ from dataclasses import dataclass, field
 from datetime import datetime, timezone
 from enum import Enum
 from types import MappingProxyType
-from typing import Any, Mapping, Sequence
+from typing import Any, Mapping
 
 from ._validation import (
     canonical_json,