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Reduce allocation pressure in the Kitty graphics receive path by caching and reusing decoded, pixel-conversion, encoded-image, and frame-composition buffers. Reuse uniquely owned pixel storage when replacing an existing image while preserving immutable update data still referenced by the renderer. Add runtime SSSE3 capability detection to CPU for future optimized paths and extend Kitty graphics tests to cover buffer reuse and strict Base64 decoding across boundary and large payload sizes.