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/app/services/memory/integration/lifecycle.py

@@ -287,7 +287,9 @@ class AgentLifecycleManager:
             # Get all current state
             all_keys = await working.list_keys()
             # Filter out checkpoint keys
-            state_keys = [k for k in all_keys if not k.startswith(self.CHECKPOINT_PREFIX)]
+            state_keys = [
+                k for k in all_keys if not k.startswith(self.CHECKPOINT_PREFIX)
+            ]
 
             state: dict[str, Any] = {}
             for key in state_keys:
@@ -483,7 +485,9 @@ class AgentLifecycleManager:
 
             # Gather session state for consolidation
             all_keys = await working.list_keys()
-            state_keys = [k for k in all_keys if not k.startswith(self.CHECKPOINT_PREFIX)]
+            state_keys = [
+                k for k in all_keys if not k.startswith(self.CHECKPOINT_PREFIX)
+            ]
 
             session_state: dict[str, Any] = {}
             for key in state_keys:
@@ -597,14 +601,16 @@ class AgentLifecycleManager:
 
         for key in all_keys:
             if key.startswith(self.CHECKPOINT_PREFIX):
-                checkpoint_id = key[len(self.CHECKPOINT_PREFIX):]
+                checkpoint_id = key[len(self.CHECKPOINT_PREFIX) :]
                 checkpoint = await working.get(key)
                 if checkpoint:
-                    checkpoints.append({
-                        "checkpoint_id": checkpoint_id,
-                        "timestamp": checkpoint.get("timestamp"),
-                        "keys_count": checkpoint.get("keys_count", 0),
-                    })
+                    checkpoints.append(
+                        {
+                            "checkpoint_id": checkpoint_id,
+                            "timestamp": checkpoint.get("timestamp"),
+                            "keys_count": checkpoint.get("keys_count", 0),
+                        }
+                    )
 
         # Sort by timestamp (newest first)
         checkpoints.sort(