Support DeepSeek V4 Flash Vision Experimental

docs/issue100-vision/full-persistent.log

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+running 1 test
+test engine::metal::deepseek_vision::tests::issue100_full_model_images_cache_and_dspark ... ds4: Metal device Apple M5 Max, 128.00 GiB RAM
+ds4: Metal 4 tensor API enabled for Tensor kernels
+ds4: drift-patch flags hc_stable=on norm_unify=on kv_raw_f32=off rope_exp2_log2=off math_safe=off tensor_matmul=on
+ds4: Metal model views created in 1.695 ms, residency requested in 461.052 ms, warmup 3.497 ms (mapped 82697.67 MiB from offset 5.09 MiB)
+ds4: Metal mapped mmaped model as 2 overlapping shared buffers
+ds4: Metal model views created in 0.143 ms, residency requested in 461.793 ms, warmup 0.639 ms (mapped 5711.67 MiB from offset 0.01 MiB)
+ds4: Metal mapped mmaped model as 3 overlapping shared buffers
+ds4: Metal model views created in 0.047 ms, residency requested in 833.434 ms, warmup 0.581 ms (mapped 889.64 MiB from offset 0.02 MiB)
+ds4: Metal mapped mmaped model as 4 overlapping shared buffers
+red: The image features a solid red square centered on a white background.
+DSpark drafted=15 accepted=10
+blue: A solid blue circle centered on a white background.
+pair: The first shape is red, and the second shape is blue.
+tool image: The color in the image is blue.
+issue100: production rendering, image recognition, multi-image/tool input, same-layout image invalidation, disk/warm KV and DSpark target equivalence passed
+ok
+
+test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 569 filtered out; finished in 15.94s