Walk up the stairs of the launch gantry tower to verify that the stairs are completely unblocked by columns and the player can reach the top platform.
Verify that the frame rate is smooth and there is no movement lag.
Stop once you have verified these visual and interactive updates.
Restructure project into core/systems/config/rocket/buildings, updating imports accordingly. Add procedural building modules (dome, facility, gantry, mc) and a new buildings/world.js that composes and merges decorative meshes for far fewer draw calls. Move many subsystems (renderer, physics, sound, particles, loaders, save) into src/systems and core gameplay into src/core. Character behavior adjusted (ladder interaction removed, enter/exit rocket helpers, start position moved to facility). Expose physics.addBoxCollider and update UI imports to new module paths.