- Add accumulation_steps config to PPOConfig with gradient accumulation
in update_mlp() using existing accumulate_grads/scale_grads utilities
- Add clip_epsilon_high: Option<f32> for asymmetric PPO clipping to
prevent entropy collapse during long training
- Rename WorkingPPO → PPO for consistency with DQN naming convention
- Add pub type WorkingPPO = PPO for backward compatibility
- Fix PPOConfig struct literals in trading_service and hyperopt adapter
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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