fix(tests): ✅ Stop asserting joblib's dispatch timing

[SongshGeo]

修 #173 上 Tests 3.11 on macos-latest 的失败。是测试写错了，不是代码有问题。

失败

tests/core/test_experiment.py::TestNumProcessInsideHydra::test_repeats_span_multiple_processes FAILED
E   AssertionError: all repeats shared one process: {2078}
1 failed, 706 passed

原因

断言写的是 4 次重复要落在多于一个 worker PID 上：

assert len(pids) > 1, f"all repeats shared one process: {pids}"

但 PID 2078 不是父进程 —— 前一条断言 pids != {os.getpid()} 是过了的。也就是说并行分支完全正常工作、loky worker 确实起来了，只是 joblib 把 4 个任务都派给了同一个 worker。

joblib 按 worker 就绪情况派发任务，而这些测试任务极短，第一个 worker 完全可能在其他 worker 启动完成之前就把 4 个都做完。这是调度时序，不是这段代码承诺的行为，我不该断言它。

改法

真正区分两个分支的是父进程：串行分支在父进程里跑，loky 永远不在。所以改成断言重复没有在父进程里执行，测试名也改成它实际检查的内容（test_repeats_runs_in_worker_processes）。

没有削弱回归能力

把 #169 的 bug 放回去，测试立刻挂：

E   AssertionError: repeats ran in the parent, so the parallel branch was skipped: {18952}
E   assert 18952 not in {18952}

修复在位时连跑 10 次全绿，全量套件 707 passed，ruff / format 通过。

与其他 PR 的关系

合进 dev 后 #173 会自动带上，Tests 3.11 on macos-latest 应当转绿。

Tests 3.13 on windows-latest 仍会红 —— 那是 dev 上七个月的老问题（#171），与此无关。

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