fix(handlers): add missing rows.Err() checks to MemoryHandler.List and EventsHandler

After `for rows.Next()` loops in List functions, add the safety-net
rows.Err() check to detect iteration errors. This was systematically
added to approvals.go, tokens.go, instructions.go in PRs #1130/#1150
— memory.go and events.go were missed.

- memory.go: MemoryHandler.List
- events.go: EventsHandler.List + ListByWorkspace

Closes #1171.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

workspace-server/internal/handlers/events.go

@@ -49,6 +49,10 @@ func (h *EventsHandler) List(c *gin.Context) {
 			"created_at":   createdAt,
 		})
 	}
+	if err := rows.Err(); err != nil {
+		log.Printf("Events list rows.Err: %v", err)
+	}
+
 	c.JSON(http.StatusOK, events)
 }
 
@@ -87,5 +91,9 @@ func (h *EventsHandler) ListByWorkspace(c *gin.Context) {
 			"created_at":   createdAt,
 		})
 	}
+	if err := rows.Err(); err != nil {
+		log.Printf("Events list-by-workspace rows.Err: %v", err)
+	}
+
 	c.JSON(http.StatusOK, events)
 }

workspace-server/internal/handlers/memory.go

@@ -54,6 +54,9 @@ func (h *MemoryHandler) List(c *gin.Context) {
 		entry.Value = json.RawMessage(value)
 		entries = append(entries, entry)
 	}
+	if err := rows.Err(); err != nil {
+		log.Printf("Memory list rows.Err: %v", err)
+	}
 
 	c.JSON(http.StatusOK, entries)
 }