feat: strengthen module contracts and shared WebUI runtime

tests/test_database_migrations.py

@@ -131,8 +131,15 @@ class DatabaseMigrationTests(unittest.TestCase):
         with tempfile.TemporaryDirectory(prefix="govoplan-core-baseline-test-") as directory:
             database = Path(directory) / "core.db"
             url = f"sqlite:///{database}"
+            enabled_modules = ("access",)
 
-            command.upgrade(alembic_config(database_url=url, enabled_modules=()), "heads")
+            command.upgrade(
+                alembic_config(
+                    database_url=url,
+                    enabled_modules=enabled_modules,
+                ),
+                "heads",
+            )
 
             engine = create_engine(url)
             try:
@@ -157,7 +164,13 @@ class DatabaseMigrationTests(unittest.TestCase):
                     ).scalar_one()
                     current = database_migration_heads(connection)
 
-                self.assertEqual(current, configured_migration_heads(url, enabled_modules=()))
+                self.assertEqual(
+                    current,
+                    configured_migration_heads(
+                        url,
+                        enabled_modules=enabled_modules,
+                    ),
+                )
                 self.assertIn("core_scopes", tables)
                 self.assertNotIn("tenancy_tenants", tables)
                 self.assertIn("access_accounts", tables)