A birthday party in the little world.

This system decorates luvcraft for a celebration: a meadow world of its own, a gazebo built from blocks, balloons and dancing gnomes drawn as signed distance fields, and a fireworks show at dusk. Each file owns one aspect and exposes a small constructor; PARTY.LISP is the only file that knows how they compose.

Shader code for these scene objects lives in sections of the same files under (in-package #:luvcraft.shaders), beside the gnome's SDF vocabulary.