feat : update

lib/presence-constants.test.ts

@@ -0,0 +1,10 @@
+import { describe, expect, it } from "vitest";
+
+import { PRESENCE_HEARTBEAT_MS, PRESENCE_TTL_MS } from "./presence-constants";
+
+describe("presence timing", () => {
+  it("expires only after several missed heartbeats", () => {
+    expect(PRESENCE_HEARTBEAT_MS).toBe(15_000);
+    expect(PRESENCE_TTL_MS).toBeGreaterThanOrEqual(PRESENCE_HEARTBEAT_MS * 3);
+  });
+});