The warmup_speculative() function was defined but never called.
Custom Metal kernels (LpB) require first-call compilation (~200ms).
Without warmup, the first speculative cycle is slow, dragging down
average TPS by 10-20% on short generations.
In mlx_bench testing: cold 48 TPS → warm 60 TPS for DFlash,
cold 39 TPS → warm 44 TPS for MTP.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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