The GPU experience collector only supported DQNAgentType::Standard, but
enable_regime_qnetwork defaults to true, creating RegimeConditional
agents. This silently fell back to CPU with a debug! message invisible
at INFO log level.
- Add primary_head() accessor to RegimeConditionalDQN (returns trending head)
- Extract weights from primary head for both collector init and weight sync
- Upgrade debug! to warn! for missing GPU collection prerequisites
- Add warn! to PPO for silent GPU skip when raw market data not uploaded
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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