Tests: avoid timer-based pi-ai stream mock

CHANGELOG.md

@@ -42,6 +42,7 @@ Docs: https://docs.clawd.bot
 - Google Chat: normalize space targets without double `spaces/` prefix.
 - Messaging: keep newline chunking safe for fenced markdown blocks across channels.
 - Tests: cap Vitest workers on CI macOS to reduce timeouts.
+- Tests: avoid fake-timer dependency in embedded runner stream mock to reduce CI flakes.
 
 ## 2026.1.23-1
 

src/agents/pi-embedded-runner.test.ts

@@ -70,7 +70,7 @@ vi.mock("@mariozechner/pi-ai", async () => {
     },
     streamSimple: (model: { api: string; provider: string; id: string }) => {
       const stream = new actual.AssistantMessageEventStream();
-      setTimeout(() => {
+      queueMicrotask(() => {
         stream.push({
           type: "done",
           reason: "stop",
@@ -80,7 +80,7 @@ vi.mock("@mariozechner/pi-ai", async () => {
               : buildAssistantMessage(model),
         });
         stream.end();
-      }, 0);
+      });
       return stream;
     },
   };