Add description for world-models topic

Author: Tariolle

topics/world-models/index.md

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+---
+display_name: World Models
+short_description: World models are neural networks that learn an internal representation of an environment's dynamics, enabling agents to simulate and plan within a learned latent space.
+topic: world-models
+---
+World models are neural networks that learn an internal representation of an environment's dynamics, enabling agents to simulate and plan within a learned latent space. They are used in model-based reinforcement learning, robotics, and autonomous decision-making.