deepfence/FlowMeter ? reverse-engineered prompt

Build me a Go command line tool that can read packet capture data, group packets into flows, and analyze the headers to classify each packet and flow as benign or malicious.

I want it to feel like a practical network analysis utility, so it should produce flow statistics, a clear summary of what it found, and a result file I can inspect after it runs. If there’s a simple machine learning part for classification, include that too, but keep it focused on useful output and low false alarms. It should be easy to run on a capture file, and if you need to check current docs or examples online while wiring it up, go ahead.

Please make the project usable from the command line, keep the code clean and organized, and include enough documentation so someone can understand how to run it and what the outputs mean.