fix: replace 59 bare except clauses with proper logging (#25)

All `except Exception:` now catch as `except Exception as exc:` with
appropriate logging (warning for critical paths, debug for graceful degradation).

Added logger setup to 4 files that lacked it:
- src/timmy/memory/vector_store.py
- src/dashboard/middleware/csrf.py
- src/dashboard/middleware/security_headers.py
- src/spark/memory.py

31 files changed across timmy core, dashboard, infrastructure, integrations.
Zero bare excepts remain. 1340 tests passing.

src/infrastructure/ws_manager/handler.py

@@ -54,7 +54,8 @@ class WebSocketManager:
         for event in list(self._event_history)[-20:]:
             try:
                 await websocket.send_text(event.to_json())
-            except Exception:
+            except Exception as exc:
+                logger.warning("WebSocket history send error: %s", exc)
                 break
 
     def disconnect(self, websocket: WebSocket) -> None:
@@ -83,8 +84,8 @@ class WebSocketManager:
                 await ws.send_text(message)
             except ConnectionError:
                 disconnected.append(ws)
-            except Exception:
-                logger.warning("Unexpected WebSocket send error", exc_info=True)
+            except Exception as exc:
+                logger.warning("Unexpected WebSocket send error: %s", exc)
                 disconnected.append(ws)
 
         # Clean up dead connections
@@ -156,7 +157,8 @@ class WebSocketManager:
             try:
                 await ws.send_text(message)
                 count += 1
-            except Exception:
+            except Exception as exc:
+                logger.warning("WebSocket direct send error: %s", exc)
                 disconnected.append(ws)
 
         # Clean up dead connections