fix: replace bare except clauses with except Exception

Bare `except:` catches BaseException including KeyboardInterrupt and
SystemExit. Replaced 29 instances with `except Exception:`.

agent/memory/storage.py

@@ -509,7 +509,7 @@ class MemoryStorage:
         """Destructor to ensure connection is closed"""
         try:
             self.close()
-        except:
+        except Exception:
             pass  # Ignore errors during cleanup
     
     # Helper methods