__main__.py: add signal.SIGHUP → SIG_IGN before setting up SIGINT/SIGTERM handlers. Sniffer no longer dies when the terminal closes or the shell session ends. README: add Background / Daemon section with nohup examples.
__main__.py: add signal.SIGHUP → SIG_IGN before setting up SIGINT/SIGTERM handlers. Sniffer no longer dies when the terminal closes or the shell session ends. README: add Background / Daemon section with nohup examples.