test: stub runner operations in the replay test-runner suite and keep runner-session tests within the size ratchet

A Simulator open schedules a best-effort runner prewarm that outlives its
request. The replay test-runner suite opened a Simulator with the real Apple
tools, so the prewarm's deferred import resolved after the file finished and
spawned into whichever file the worker ran next, where the hermetic signal
guard failed an unrelated test.

Author: thymikee

packages/platform-apple/src/runner/__tests__/runner-session.test.ts

@@ -666,11 +666,8 @@ test('runner session starts xcodebuild through provider seams and reuses an aliv
     mockRunXcrun.mock.calls.some((call) => call[0]?.includes('uninstall')),
     false,
   );
-  assert.deepEqual(getRunnerSessionSnapshot(device.id), {
-    sessionId: session.sessionId,
-    alive: true,
-    ready: session.ready,
-  });
+  const expected = { sessionId: session.sessionId, alive: true, ready: false };
+  assert.deepEqual(getRunnerSessionSnapshot(device.id), expected);
 });
 
 test('runner session emits XCTest startup progress only after a runner rebuild', async () => {

src/daemon/replay/internal/__tests__/session-test-runner.test.ts

@@ -14,6 +14,22 @@ import type { DaemonRequest } from '../../../types.ts';
 import { handleSessionCommands } from '../../../handlers/__tests__/session-command-harness.ts';
 import { mkdtempForTestSync } from '../../../../__tests__/test-utils/tmp-dir.ts';
 
+// Opening a Simulator schedules a best-effort runner prewarm that outlives the request; a real one
+// would spawn xcodebuild after this file finished and land in whichever file the worker runs next.
+vi.mock('@agent-device/platform-apple/runner/operations', async (importOriginal) => {
+  const actual =
+    await importOriginal<typeof import('@agent-device/platform-apple/runner/operations')>();
+  return {
+    ...actual,
+    prewarmAppleRunnerCache: vi.fn(),
+    prewarmIosRunnerSession: vi.fn(),
+    notifyIosRunnerAppRelaunched: vi.fn(async () => {}),
+    hasLiveIosRunnerSession: vi.fn(() => false),
+    scheduleIosRunnerIdleStop: vi.fn(),
+    stopIosRunnerSession: vi.fn(async () => {}),
+  };
+});
+
 test('session_list includes device_udid and ios_simulator_device_set for iOS sessions', async () => {
   const sessionStore = makeSessionStore();
   sessionStore.set(