Module cleanup 

Signal handler registration and cleanup coordination

Structs

CleanupGuard

Cleanup guard that ensures cleanup runs on drop

Functions

is_cleanup_requested

Check if cleanup has been requested (e.g., via signal)

register_signal_handlers

Register signal handlers for graceful shutdown Handles SIGINT (Ctrl+C), SIGTERM, and SIGHUP on Unix

request_cleanup

Request cleanup (sets the global flag)