style(memory): apply ruff formatting and linting fixes

Auto-fixed linting errors and formatting issues:
- Removed unused imports (F401): pytest, Any, AnalysisType, MemoryType, OutcomeType
- Removed unused variable (F841): hooks variable in test
- Applied consistent formatting across memory service and test files

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/tests/unit/services/memory/integration/test_context_source.py

@@ -133,9 +133,7 @@ class TestMemoryContextSource:
         )
 
         assert result.by_type["working"] == 2
-        assert all(
-            c.memory_subtype == MemorySubtype.WORKING for c in result.contexts
-        )
+        assert all(c.memory_subtype == MemorySubtype.WORKING for c in result.contexts)
 
     @patch("app.services.memory.integration.context_source.EpisodicMemory")
     async def test_fetch_episodic_memory(
@@ -252,11 +250,10 @@ class TestMemoryContextSource:
         context_source: MemoryContextSource,
     ) -> None:
         """Results should be sorted by relevance score."""
-        with patch.object(
-            context_source, "_fetch_episodic"
-        ) as mock_ep, patch.object(
-            context_source, "_fetch_semantic"
-        ) as mock_sem:
+        with (
+            patch.object(context_source, "_fetch_episodic") as mock_ep,
+            patch.object(context_source, "_fetch_semantic") as mock_sem,
+        ):
             # Create contexts with different relevance scores
             from app.services.context.types.memory import MemoryContext
 

backend/tests/unit/services/memory/integration/test_lifecycle.py

@@ -105,6 +105,7 @@ class TestLifecycleHooks:
 
     def test_register_spawn_hook(self, lifecycle_hooks: LifecycleHooks) -> None:
         """Should register spawn hook."""
+
         async def my_hook(event: LifecycleEvent) -> None:
             pass
 
@@ -115,7 +116,7 @@ class TestLifecycleHooks:
 
     def test_register_all_hooks(self, lifecycle_hooks: LifecycleHooks) -> None:
         """Should register hooks for all event types."""
-        hooks = [
+        [
             lifecycle_hooks.on_spawn(AsyncMock()),
             lifecycle_hooks.on_pause(AsyncMock()),
             lifecycle_hooks.on_resume(AsyncMock()),