Support chunked prefill with prefix KV cache reuse in Tunix Gemma 4. - #1906
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- Add prefix Key/Value cache reuse for chunked prefill across global linear caches and sliding-window ring buffers. - Implement prefix length bucketing to prevent XLA recompilation storms. - Advance cache end index strictly by non-PAD token counts with ragged mask support. PiperOrigin-RevId: 975923437
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Support chunked prefill with prefix KV cache reuse in Tunix Gemma 4.