Add Vulkan variants (fp16, int8)

Add int8 MLX variant; remove bf16 (OOM-killed on device)

Replace .pte files with reexported versions including dynamic dims companion methods

Replace .pte files with reexported versions including dynamic dims companion methods

Add MLX model

remove old fp32

Add CoreML model

Restructure to MODEL_SPEC.md convention

Improve exported model & bundle methods

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