fix: stabilize plugin startup boundaries

src/process/command-queue.test.ts

@@ -152,6 +152,22 @@ describe("command queue", () => {
     }
   });
 
+  it("demotes live model switch lane failures to debug noise", async () => {
+    const error = new Error("Live session model switch requested: anthropic/claude-opus-4-6");
+    error.name = "LiveSessionModelSwitchError";
+
+    await expect(
+      enqueueCommandInLane("nested", async () => {
+        throw error;
+      }),
+    ).rejects.toBe(error);
+
+    expect(diagnosticMocks.diag.error).not.toHaveBeenCalled();
+    expect(diagnosticMocks.diag.debug).toHaveBeenCalledWith(
+      expect.stringContaining("lane task interrupted: lane=nested"),
+    );
+  });
+
   it("getActiveTaskCount returns count of currently executing tasks", async () => {
     const { task, release } = enqueueBlockedMainTask();