goldstac/taskman ? reverse-engineered prompt

Build me a tiny terminal task manager that feels simple and reliable. I want to be able to add a task from the command line, list my saved tasks, and see a version message, and if I run it with no arguments it should show help. Please keep it very lightweight, with everything in one C++ file if possible, and no extra dependencies or config files.

Store the tasks locally in a plain text file under my home folder so they survive between runs, and create that file automatically the first time I use it. I also want an easy install script that can build it and put the executable somewhere on my PATH, plus a quick build script for local use. Keep the experience clean and no nonsense, just a practical little tool I can use from any terminal. If you need to check current docs for anything, look them up online.