File heartbeatService.test.ts

src/node/services/heartbeatService.test.ts:None–None

import { describe, test, expect, beforeEach, mock, afterEach } from "bun:test";
import type { MuxMessage } from "@/common/types/message";
import { createMuxMessage } from "@/common/types/message";
import type { ProjectConfig, ProjectsConfig, Workspace } from "@/common/types/project";