nx_gif_color_gate.nx

nx_gif_color_gate.nx -- gate for C2 of the codec-chokepoint program (debt 1785903075): GIF palette COLOR decode + DE-INTERLACE, at the decoder (gif_decode_rgb) AND through the shared chokepoint (nx_img_bytes_to_rgb). Fixtures are hand-built byte-exact GIF89a files: a 4x4 4-colour palette image stored non-interlaced (rows 0,1,2,3) and interlaced (pass order 0,2,1,3 + descriptor bit 6), whose DECODED images must be identical. The synthetic LZW uses CLEAR-before-every-literal (no dictionary growth), so T6 decodes a REAL gathered web GIF (third-party encoder, real dictionary growth) as the independent witness. Inherits nx_gate_verdict. license_tier: ORIGINAL expect_exit: 0