Pure Rust GIF decoder in the image crate supporting: - GIF87a and GIF89a format parsing - LZW decompression with variable-width codes, clear/EOI codes - Global and local color tables - Graphic Control Extension (transparency, delay, disposal methods) - Multi-frame animated GIFs with canvas compositing - Interlaced image support (4-pass Adam7-style deinterlacing) - Sub-frame positioning (frames smaller than logical screen) - Application, comment, and plain text extension skipping - API: decode_gif() for first frame, decode_gif_frames() for all frames 31 unit tests covering LZW decompression, deinterlacing, frame decoding, transparency, animation, local color tables, extensions, and error cases. No external dependencies, no unsafe. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>