feat: add campaign copying scheduling and residual handling

tests/test_artifact_reconciliation.py

@@ -240,6 +240,7 @@ def test_process_loss_orphan_is_deleted_once_and_same_request_replays(
 def test_competing_node_cannot_acquire_cleanup_authority(
     recovery_session_factory,
 ) -> None:
+    lease_observed_at = datetime.now(timezone.utc)
     with recovery_session_factory() as session:
         claim = acquire_lease(
             session,
@@ -248,7 +249,7 @@ def test_competing_node_cannot_acquire_cleanup_authority(
             holder_node_id="node-other",
             holder_incarnation="run-other",
             ttl_seconds=900,
-            now=NOW,
+            now=lease_observed_at,
         )
         assert claim is not None
         session.commit()