perf(test): speed up subagent persistence e2e flushes

src/agents/subagent-registry.persistence.e2e.test.ts

@@ -24,7 +24,9 @@ vi.mock("../infra/agent-events.js", () => ({
   onAgentEvent: vi.fn(() => noop),
 }));
 
-const announceSpy = vi.fn(async () => true);
+const { announceSpy } = vi.hoisted(() => ({
+  announceSpy: vi.fn(async () => true),
+}));
 vi.mock("./subagent-announce.js", () => ({
   runSubagentAnnounceFlow: announceSpy,
 }));
@@ -47,7 +49,9 @@ describe("subagent registry persistence", () => {
     childSessionKey: string;
     task: string;
     cleanup: "keep" | "delete";
-  }) => ({
+  }) => {
+    const now = Date.now();
+    return {
       version: 2,
       runs: {
         [params.runId]: {
@@ -57,17 +61,23 @@ describe("subagent registry persistence", () => {
           requesterDisplayKey: "main",
           task: params.task,
           cleanup: params.cleanup,
-        createdAt: 1,
+          createdAt: now - 2,
-        startedAt: 1,
+          startedAt: now - 1,
-        endedAt: 2,
+          endedAt: now,
         },
       },
-  });
+    };
+  };
+
+  const flushQueuedRegistryWork = async () => {
+    await Promise.resolve();
+    await Promise.resolve();
+  };
 
   const restartRegistryAndFlush = async () => {
     resetSubagentRegistryForTests({ persist: false });
     initSubagentRegistry();
-    await new Promise((r) => setTimeout(r, 0));
+    await flushQueuedRegistryWork();
   };
 
   afterEach(async () => {
@@ -117,7 +127,7 @@ describe("subagent registry persistence", () => {
     initSubagentRegistry();
 
     // allow queued async wait/cleanup to execute
-    await new Promise((r) => setTimeout(r, 0));
+    await flushQueuedRegistryWork();
 
     expect(announceSpy).toHaveBeenCalled();
 
@@ -169,7 +179,7 @@ describe("subagent registry persistence", () => {
     resetSubagentRegistryForTests({ persist: false });
     initSubagentRegistry();
 
-    await new Promise((r) => setTimeout(r, 0));
+    await flushQueuedRegistryWork();
 
     // announce should NOT be called since cleanupHandled was true
     const calls = (announceSpy.mock.calls as unknown as Array<[unknown]>).map((call) => call[0]);