Remove dead code and wire the two-worker smoke script

scimesh/sdk/conformance.py

@@ -24,7 +24,7 @@ from .artifacts import (
     OutputManifest,
     Provenance,
 )
-from .identity import ComponentRef, SDK_API_VERSION, SchemaRef
+from .identity import ComponentRef, SDK_API_VERSION
 from .execution import NetworkPolicy, ProcessModel
 from .manifest import TrustMode, WorkloadManifest
 from .plans import JobRequest, TaskSpec
@@ -686,9 +686,6 @@ class CancellationFlag:
     def __init__(self) -> None:
         self._event = Event()
 
-    def cancel(self) -> None:
-        self._event.set()
-
     def cancelled(self) -> bool:
         return self._event.is_set()