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The DFlash benchmark with --draft-sliding-window-size 4096 on the 9B model causes a Metal GPU timeout on Apple Silicon (kIOGPUCommandBufferCallbackErrorTimeout). Root cause: the 9B model's larger compute workload combined with a 4096-size draft sliding window produces GPU command buffers that exceed the watchdog timeout. The 4B model does not exhibit this problem. Mitigation: lower the default draft sliding window for the 9B pair from 4096 to 2048. This avoids the timeout while still providing meaningful speedup. Changes: - Add benchmarks/dflash_apple_silicon.py (DFlash benchmark planner) - 9B pair now uses draft_sliding_window_size=2048 - 4B pair retains draft_sliding_window_size=4096 - Add tests/test_dflash_apple_silicon.py with #154-specific test - Add docs/DFLASH_APPLE_SILICON.md documenting the mitigation - Add benchmarks/reports/dflash_m3max_36gb_qwen35_9b_timeout.md recording failure Verification: pytest -q tests/test_dflash_apple_silicon.py Test explicitly asserts 9B uses window=2048 to prevent timeout regression. Closes #154