SwanField - Prototype version

Asset level PPO:

Shared Encoder (seq + non-seq) 
        ↓
    Shared Latent h
        ↓
   ┌───────────────┬───────────────┬───────────────┐
   │ Actor Head 1  │ Actor Head 2  │ Actor Head 3  │
   │ Categorical(3)│   Signal dist │ Memory dist   │
   └───────────────┴───────────────┴───────────────┘
                ↓
            Critic Head