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c16f6f8b68
* temp regrtest save_env patch * Refactor signal_handlers from Option to OnceCell - Change `signal_handlers` type from `Option<Box<...>>` to `OnceCell<Box<...>>` so fork children can lazily initialize it - Add `VirtualMachine::is_main_thread()` using runtime thread ID comparison instead of structural `signal_handlers.is_none()` check - Initialize signal handlers in `py_os_after_fork_child()` via `get_or_init()` for workers that fork - Use `get_or_init()` in `signal()` and `getsignal()` functions - Remove `set_wakeup_fd(-1)` special-case workaround (d6d0303) - Extract `signal::new_signal_handlers()` to deduplicate init expr - Allow `getsignal()` from any thread (matches CPython behavior) - Fix `set_wakeup_fd` error message to name the correct function