Dookoo2/Cyclone ? reverse-engineered prompt

Build me a fast command line app that helps search for Bitcoin Satoshi puzzle private keys on the CPU. It should run on both Linux and Windows, use modern CPU speedups if available, and automatically take advantage of AVX2 or AVX512 for better performance.

I want it to be able to search within a private key range for a target Bitcoin address, show live progress, speed, total checked, and estimated progress, and save its work every few minutes so it can resume later. It should also support a more flexible search mode where I can jump ahead, look for partial matches, and save candidate results to a file when I ask for it.

Please make the output clear and practical, including the private key, public key, WIF, and address when a match is found. If anything is unclear, use the current docs or look up what you need online.