fyr_ember

GPU ember swarm for the pyre part. The mesh is a Geo.pointCloud of tiny octahedra whose authored centers fill the whole flight volume (so the static AABB covers every animated position): vertex normal = unit offset from the ember's center, uv = (seed, size). The vertex stage recovers each center, treats its authored height as a cycle phase, and flies the ember up a widening spiral with wind drift and per-seed speed / swirl / death height — hundreds of embers with zero per-frame CPU. Transparent queue; the part drives game_t and ember_boost (music) per frame.