yairm210/Unciv ? reverse-engineered prompt

Build me a playable open source Civilization V style strategy game for Android and desktop. It should feel like a small, fast, moddable 4X game, with turn based gameplay, city building, units, tech progression, diplomacy, and the usual Civ style flow from founding a city to winning the game. I want a clean menu, a usable in game help section, save and load, and a simple way to support mods and custom content so people can tweak the game without touching code.

Make it run well on modest hardware, and keep the UI usable on both mobile and desktop. If there are any missing details in the original game rules, look up current docs online if you need to, then fill in the gaps in a sensible way. Please make sure the project builds and runs from the repo as a complete game I can test locally.