T4tsuk3i/Sunrise-T4tsuk3i ? reverse-engineered prompt

Build me a Destiny 2 offline preservation mod that runs locally and opens an in game overlay when I press Insert. I want it to let me load into destinations offline, recreate some missions, and use simple exploration tools like fly, noclip, and changing the current activity. Please include a persistent save so settings and progress can carry over between launches, and make the overlay easy to open and close.

It should be clear that this is not a custom server or anything that connects online, it just works with a user provided install and runs on the old build of the game. Keep it focused on the core offline features first, with room for more mission and exploration support later. If you need to look up any current docs or APIs, feel free to do that.