Format updates to instructions and test file

- Improve markdown formatting in instructions.md
- Reorder imports in test_background_loader_session.py per PEP8

tests/unit/test_background_loader_session.py

@@ -4,14 +4,15 @@ Unit tests for BackgroundLoaderService database session handling.
 This module tests that the background loader service properly uses async context
 managers for database sessions, preventing TypeError with async for.
 """
-import pytest
-from unittest.mock import AsyncMock, MagicMock, patch
 from datetime import datetime, timezone
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import pytest
 
 from src.server.services.background_loader_service import (
     BackgroundLoaderService,
-    SeriesLoadingTask,
     LoadingStatus,
+    SeriesLoadingTask,
 )
 
 
@@ -277,7 +278,7 @@ async def test_async_context_manager_usage():
     """
     from contextlib import asynccontextmanager
     from typing import AsyncGenerator
-    
+
     # Create a test async context manager
     call_log = []