Zijie Tian 6575099a06 [refactor] Cleanup unused code after perf_opt merge ...

Removed ~460 lines of unused/redundant code from offload_engine.py:
- CUDA gather methods (gathered_h2d_*, update_gather_indices)
- Legacy async transfer methods (prefetch_block_async, offload_block_async)
- Legacy sync/wait methods (wait_for_block, wait_all_transfers, sync_indices)
- Legacy compatibility methods (load_to_compute_layer, wait_compute_layer)
- Unused gather_indices tensors and memory calculations

Updated class docstring to reflect current architecture.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-07 06:25:21 +08:00

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