feat(KB-648): enable parallel test execution and optimize test performance

- Optimize backup tests using fake timers instead of real timeouts

- Enable parallel file execution in core, engine, CLI, and dashboard packages

- Add inline test helpers to reduce dependencies in dashboard routes tests

- Update executor tests with exact command matching and improved assertions

- Update AGENTS.md with test optimization patterns (fake timers, unique temp dirs)

packages/dashboard/app/components/TaskComments.tsx

@@ -1,5 +1,5 @@
 import { useMemo, useState } from "react";
-import type { Task, TaskComment } from "@fusion/core";
+import type { Task, TaskComment } from "@kb/core";
 import { addTaskComment, updateTaskComment, deleteTaskComment } from "../api";
 import type { ToastType } from "../hooks/useToast";