nx_webp_vp8l_gate.nx

nx_webp_vp8l_gate.nx -- proves the VP8L pixel-decoder math and the WebP container walk. These are the pieces that decide whether a decoded image is CORRECT rather than merely produced: the 14 predictors, the per-channel average, the distance-plane mapping (VP8L's 2-D neighbourhood addressing, where an off-by-one silently shifts every back-reference), the prefix-code value rule, and the 5-byte header. NON-VACUITY: T10/T11/T12 are negative controls -- a non-RIFF buffer, a RIFF that is not WEBP, and a bad VP8L signature must each be REFUSED. A decoder that returns a plausible buffer for garbage is worse than one that returns nothing. license_tier: ORIGINAL