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Closes the documented gap where EXIF/XMP fields inside AVIF/HEIF/JXL went unparsed. metadata.exif_generator extracts the EXIF Software/Artist tag (via PIL+piexif, which opens AVIF natively) and the XMP CreatorTool (via a container-agnostic raw-byte scan that also covers HEIF/JXL that PIL can't open), and matches against AI_GENERATOR_TOKENS so only generator names (Firefly, DALL-E, Midjourney, ComfyUI, ...) fire -- a plain 'Adobe Photoshop' or 'GIMP' tag is not flagged. identify() surfaces it as a high-confidence signal and uses it for platform attribution when no C2PA names a platform, so an AVIF/HEIF whose only AI signal is an EXIF/XMP generator tag is now caught. Validated with synthesized fixtures (the 'no positive fixtures' blocker was self-imposed): real AVIF and JPEG written with EXIF Software via PIL, plus an XMP CreatorTool raw-scan fixture. Zero false positives across the 109-image corpus (real iPhone photos carry no AI generator token). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>