Module resources 

The attractor’s GPU resources: the three uniform blocks, the three resource holders, and their bind-group helpers (Plan 0061 Phase 6).

This is the wgpu half of particles/ — buffers, layouts, pipelines and the bind groups that wire them together. The scene that drives them, its Scene impl and the encode_* passes stay in mod.rs; the ODE math it draws is in family, which imports no wgpu at all.