Root cause: shmem_max_in_dim only included trunk dims (state_dim,
shared_h1, shared_h2) but not head dims (value_h, adv_h). When
hidden_dim_base=32 made the trunk narrow while heads stayed at 128,
the BF16 weight tile for branch output (255×128=32640 BF16 elements)
overflowed the shared memory region (12288 BF16 elements). On H100
the overflow landed in unused-but-mapped hardware shmem (silent
corruption). On RTX 3050 (48KB physical shmem) it hit unmapped
memory → CUDA_ERROR_ILLEGAL_ADDRESS.
Changes:
- gpu_dqn_trainer.rs: shmem_max_in_dim includes value_h/adv_h
- Remove all #[ignore] from smoke tests (feature_coverage,
training_stability, gpu_residency)
- Smoke tests use real .dbn data from test_data/ (hard error if missing)
- Remove synthetic_data() fallback — no fake data in tests
- GPU-direct DtoD training path (train_step_gpu, FusedTrainScalars)
- GPU-native PER priority update kernel (zero CPU readback)
- IQN dual-head integration (gpu_iqn_head.rs)
- BF16 dtype fixes across 6 model adapters
- Hyperopt 30D→31D (iqn_lambda)
- portfolio_transformer: unconditional BF16 (remove dead CPU branches)
- liquid/adapter: all tests use Cuda(0) directly
- Fix pre-existing gpu_kernel_parity_test.rs (stale args)
- Fix pre-existing evaluate_baseline.rs (removed fields)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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