Supervisor for brain system components.

This supervisor manages the inference and learning processes that together form a brain system. The supervision strategy is one_for_all because learning depends on inference state.

Architecture

brain_sup (one_for_all) | +-- brain (inference GenServer) | Forward propagation | Visualization data | Network state management | Publishes: evaluated | +-- brain_learner (learning GenServer) [optional] Plasticity rule application Experience buffer Weight updates Subscribes to: evaluated, reward_received Publishes: weights_updated

Communication

Subsystems communicate via brain_pubsub (built on OTP pg): - brain publishes evaluated after each forward pass - brain_learner subscribes to receive activations - brain_learner publishes weights_updated after learning - brain subscribes to update its network weights

Future Expansion

This supervisor is designed to accommodate future brain subsystems: - brain_memory: Episodic memory storage - brain_attention: Focus and salience control - brain_prediction: Forward model / world model