Star Harvest

Unlocked by scrapping Sol itself. They built a star-mech; you took the star. Launch collector satellites on long timers with growing Alloy and Components costs.

• Each satellite adds +2 percent to the Mech Core's power output, the root of every build. Fifty satellites is +100 percent: the one deliberately big multiplier, safe because it is the last.
• The Smelter feeds the Alloy bill; the frontier feeds the Components bill. The Interlock closes its loop here.
• At fifty, the swarm completes and REBOOT is revealed: the post-launch nested-prestige layer, with Solar Joules as its currency. The victory lap points at the next loop.