[Bug] ModuleNotFoundError: No module named 'resource'

从 issue 中所示的 task_queue.py 里的 resource 导入和 get_memory_mb 函数开始。在 Windows 上运行 uvx agent-task-queue@latest 以复现 ModuleNotFoundError，然后验证命令能够成功启动，并且在没有导入错误的情况下报告进程内存。

Describe the bug
Encountered error while attempting to run agent-task-queue

To Reproduce:
Steps to reproduce the behavior:

1. Run command $uvx agent-task-queue@latest$
2. Encountered error

Traceback (most recent call last):
  File "<frozen runpy>", line 203, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "C:\Users\sheld\AppData\Local\uv\cache\archive-v0\d0WBs-76xzVqcxx1\Scripts\agent-task-queue.exe\__main__.py", line 4, in <module>
    from task_queue import main
  File "C:\Users\sheld\AppData\Local\uv\cache\archive-v0\d0WBs-76xzVqcxx1\Lib\site-packages\task_queue.py", line 12, in <module>
    import resource
ModuleNotFoundError: No module named 'resource'

Environment (please complete the following information):

• OS: Windows 11

Additional Notes
import resource is Linux\MacOS specific.

For cross-compatibility, we could use

import os
import psutil

then change

def get_memory_mb() -> float:
    """Get current process memory usage in MB (RSS - resident set size)."""
    usage = resource.getrusage(resource.RUSAGE_SELF)
    # ru_maxrss is in bytes on Linux, kilobytes on macOS
    if os.uname().sysname == "Darwin":
        return usage.ru_maxrss / (1024 * 1024)  # KB to MB
    return usage.ru_maxrss / 1024  # bytes to MB on Linux

to

def get_memory_mb() -> float:
    """Get current process memory usage in MB (RSS - resident set size)."""
    return psutil.Process(os.getpid()).memory_info().rss / (1024 ** 2)