docs: Add DQN algorithm fix implementation plan (11 tasks)
Detailed TDD implementation plan for:
- Task 1: Bug fixes (NaN panic, Adam eps, dedup enum)
- Task 2: State dimension consolidation (→51)
- Task 3-5: CQL offline RL regularization
- Task 4,6-9: IQN distributional RL (replaces broken C51)
- Task 8: CVaR risk-aware action selection
- Task 10-11: Integration test and verification
Each task has exact file paths, code, test commands, and safety gates.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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