Add measured on-device speed table; note wi8 runtime requirement

#11
LiteRT Community (FKA TFLite) org

Thanks for the MiniCPM5 bundles β€” the new gpu_opt build shows a real GPU win on this machine (+18% decode over the non-opt int4 file). This PR adds a measured speed table for all three files and documents one thing that cost me a debugging pass: the dynamic_wi8 file needs litert-lm >= 0.16 β€” on 0.15 it fails to load with 'Unsupported model type', which is hard to trace back to a runtime version without trying both. Measured with the litert-lm CLI (benchmark -p 256 -d 256 --runs 3 --cache no) on an idle Apple M4 Max, generation-gated first (the backend produced correct text before any number was recorded). Happy to adjust the format if you'd like these to read differently.

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