Add governed form handoffs

tests/test_migrations.py

@@ -14,7 +14,9 @@ from govoplan_forms_runtime.backend.manifest import get_manifest as get_runtime_
 
 class FormsRuntimeMigrationTests(unittest.TestCase):
     def test_fresh_migration_creates_runtime_store_and_head(self) -> None:
-        with tempfile.TemporaryDirectory(prefix="govoplan-forms-runtime-migration-") as directory:
+        with tempfile.TemporaryDirectory(
+            prefix="govoplan-forms-runtime-migration-"
+        ) as directory:
             url = f"sqlite:///{Path(directory) / 'forms-runtime.db'}"
             migrate_database(
                 database_url=url,
@@ -29,11 +31,12 @@ class FormsRuntimeMigrationTests(unittest.TestCase):
                         "form_instance_identities",
                         "form_instance_revisions",
                         "form_instance_events",
+                        "form_handoff_effects",
                     }.issubset(inspect(engine).get_table_names())
                 )
                 with engine.connect() as connection:
                     self.assertIn(
-                        "f2a3b4c5d6e7",
+                        "a3d5f7b9c1e2",
                         set(MigrationContext.configure(connection).get_current_heads()),
                     )
             finally: