CachedPtrs:
- 35-field struct caching all GPU buffer u64 device pointers
- Computed once at construction, replaces 110+ raw_device_ptr() per step
- Eliminates cudarc event tracking machinery from hot path
Sync removal:
- apply_iqn_trunk_gradient: removed cuStreamSynchronize (same-stream ordering)
- apply_ensemble_trunk_gradient: removed cuStreamSynchronize
- run_ensemble_step: removed cuStreamSynchronize + local EvtGuard struct
- replay_adam_and_readback: zero per-step DtoH — returns 0.0, epoch boundary
uses GPU training guard's accumulator buffer for actual metrics
Logging cleanup:
- Removed per-step tracing::info diagnostic with cuStreamSync (was every 1000 steps)
- Removed per-step tracing::debug for IQL/IQN/CQL (format overhead in debug builds)
- Single tracing::debug at end of run_full_step (zero cost in release)
EventTrackingGuard made pub(crate) for fused_training.rs access.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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