Embedding: TypeError: signal handler must be signal.SIG_IGN, signal.SIG_DFL, or a callable object

Bug report

Bug description:

When using PEP 578 and 551 entry points to log python activity on Fedora-41, it results in above error.
setting TERM=dumb is a valid workaround

build ok (tested on Fedora 41/python 3.13.2)
usage nok (TypeError, see readme.md)

$ ./spython
Python 3.13.2 (main, Feb  4 2025, 00:00:00) [GCC 14.2.1 20250110 (Red Hat 14.2.1-7)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> print("hello")
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/usr/lib64/python3.13/_pyrepl/__main__.py", line 6, in <module>
    __pyrepl_interactive_console()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib64/python3.13/_pyrepl/main.py", line 59, in interactive_console
    run_multiline_interactive_console(console)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/usr/lib64/python3.13/_pyrepl/simple_interact.py", line 143, in run_multiline_interactive_console
    statement = multiline_input(more_lines, ps1, ps2)
  File "/usr/lib64/python3.13/_pyrepl/readline.py", line 389, in multiline_input
    return reader.readline()
           ~~~~~~~~~~~~~~~^^
  File "/usr/lib64/python3.13/_pyrepl/reader.py", line 806, in readline
    self.restore()
    ~~~~~~~~~~~~^^
  File "/usr/lib64/python3.13/_pyrepl/reader.py", line 659, in restore
    self.console.restore()
    ~~~~~~~~~~~~~~~~~~~~^^
  File "/usr/lib64/python3.13/_pyrepl/unix_console.py", line 380, in restore
    signal.signal(signal.SIGWINCH, self.old_sigwinch)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.13/signal.py", line 58, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
TypeError: signal handler must be signal.SIG_IGN, signal.SIG_DFL, or a callable object

Follow-up of
https://github.com/juju4/spython/tree/devel-journald/journald (code)
https://github.com/zooba/spython/issues/13

CPython versions tested on:

3.13

Operating systems tested on:

Linux

まず、Python 3.13.2 を使用して Fedora 41 上で ./spython セッションを再現し、通常の動作と TERM=dumb の場合を比較します。_pyrepl/unix_console.py と signal.py の traceback パスを読み、restore() と SIGWINCH ハンドラーに注目します。TERM の回避策なしで埋め込みインタラクティブコンソールが動作し、その動作が適切な回帰テストでカバーされれば完了です。