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GPUParticleSystem lacks attractor support (feature parity with CPU ParticleSystem)

GPUParticleSystem lacks attractor support (feature parity with CPU ParticleSystem): a task in LegoFlow-SWE (Harbor dataset). Summary The CPU‑based ParticleSystem already provides particle attractors, but GPUParticleSystem has no attractor functionality. Developers relying on GPU particles cannot…

The task

**Summary** The CPU‑based `ParticleSystem` already provides particle attractors, but `GPUParticleSystem` has no attractor functionality. Developers relying on GPU particles cannot use attractors to influence particle motion.

Part of Lego-X/LegoFlow-SWE.