GpuReplayBuffer, DQNTrainer
GpuExperienceCollector + GpuReplayBuffer: added Drop with cuStreamSync
to prevent cuMemFree racing with pending GPU work.
DQNTrainer: explicit Drop that releases GPU resources (fused_ctx,
experience collector) BEFORE cuda_stream and CudaContext drop. Without
this, the Drop order follows declaration order — GPU resources that sync
on the stream would sync on an already-destroyed stream.
hidden_dim_base from_continuous: clamp floor 256→64 to allow smoketest
and Phase Fast (hidden_dim=128) networks.
VRAM is properly released (nvidia-smi shows 0 MiB after trial).
Trial 2 CUDA_ERROR_INVALID_VALUE on bind_to_thread is a cudarc 0.19
primary context reuse issue — not VRAM related.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
b19e952920