fix: thread accountId through subagent announce delivery

Co-authored-by: Adam Holt <adam91holt@users.noreply.github.com>

src/agents/subagent-announce.format.test.ts

@@ -153,4 +153,42 @@ describe("subagent announce formatting", () => {
     );
     expect(agentSpy).not.toHaveBeenCalled();
   });
+
+  it("queues announce delivery with origin account routing", async () => {
+    const { runSubagentAnnounceFlow } = await import("./subagent-announce.js");
+    embeddedRunMock.isEmbeddedPiRunActive.mockReturnValue(true);
+    embeddedRunMock.isEmbeddedPiRunStreaming.mockReturnValue(false);
+    sessionStore = {
+      "agent:main:main": {
+        sessionId: "session-456",
+        lastChannel: "whatsapp",
+        lastTo: "+1555",
+        lastAccountId: "kev",
+        queueMode: "collect",
+        queueDebounceMs: 0,
+      },
+    };
+
+    const didAnnounce = await runSubagentAnnounceFlow({
+      childSessionKey: "agent:main:subagent:test",
+      childRunId: "run-999",
+      requesterSessionKey: "main",
+      requesterDisplayKey: "main",
+      task: "do thing",
+      timeoutMs: 1000,
+      cleanup: "keep",
+      waitForCompletion: false,
+      startedAt: 10,
+      endedAt: 20,
+      outcome: { status: "ok" },
+    });
+
+    expect(didAnnounce).toBe(true);
+    await new Promise((r) => setTimeout(r, 5));
+
+    const call = agentSpy.mock.calls[0]?.[0] as { params?: Record<string, unknown> };
+    expect(call?.params?.channel).toBe("whatsapp");
+    expect(call?.params?.to).toBe("+1555");
+    expect(call?.params?.accountId).toBe("kev");
+  });
 });