fix: enqueue system event on model switch

src/auto-reply/reply.directive.test.ts

@@ -28,6 +28,7 @@ import {
   extractVerboseDirective,
   getReplyFromConfig,
 } from "./reply.js";
+import { drainSystemEvents } from "../infra/system-events.js";
 
 async function withTempHome<T>(fn: (home: string) => Promise<T>): Promise<T> {
   const base = await fs.mkdtemp(path.join(os.tmpdir(), "clawdis-reply-"));
@@ -425,6 +426,36 @@ describe("directive parsing", () => {
     });
   });
 
+  it("queues a system event when switching models", async () => {
+    await withTempHome(async (home) => {
+      drainSystemEvents();
+      vi.mocked(runEmbeddedPiAgent).mockReset();
+      const storePath = path.join(home, "sessions.json");
+
+      await getReplyFromConfig(
+        { Body: "/model Opus", From: "+1222", To: "+1222" },
+        {},
+        {
+          agent: {
+            model: "openai/gpt-4.1-mini",
+            workspace: path.join(home, "clawd"),
+            allowedModels: ["openai/gpt-4.1-mini", "anthropic/claude-opus-4-5"],
+            modelAliases: {
+              Opus: "anthropic/claude-opus-4-5",
+            },
+          },
+          session: { store: storePath },
+        },
+      );
+
+      const events = drainSystemEvents();
+      expect(events).toContain(
+        "Model switched to Opus (anthropic/claude-opus-4-5).",
+      );
+      expect(runEmbeddedPiAgent).not.toHaveBeenCalled();
+    });
+  });
+
   it("uses model override for inline /model", async () => {
     await withTempHome(async (home) => {
       const storePath = path.join(home, "sessions.json");