chore: update backend tests

backend/tests/test_smoke_plugins.py

@@ -1,3 +1,11 @@
+# #region Test.SmokePlugins [C:3] [TYPE Module] [SEMANTICS test,plugin,smoke,loader,integration]
+# @BRIEF Smoke tests verifying plugin discovery, instantiation, and TaskManager integration.
+# @RELATION BINDS_TO -> [PluginLoader]
+# @RELATION BINDS_TO -> [TaskManager]
+# @TEST_EDGE: missing_plugin -> Missing expected plugins detected
+# @TEST_EDGE: plugin_import_error -> Plugin load fails gracefully
+# @TEST_EDGE: task_manager_init_failure -> TaskManager initialization error handled
+# @RATIONALE Smoke tests exercise the full plugin loading chain without external deps.
 import os
 from pathlib import Path
 import pytest
@@ -86,3 +94,4 @@ class TestPluginSmoke:
                 manager._flusher_thread.join(timeout=2)
 
             assert manager is not None
+# #endregion Test.SmokePlugins