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remove_ai_metadata now scrubs AI tags from the JPEG EXIF instead of passing
the block through wholesale. Closes the v0.5.5 follow-up: the xAI/Grok
Signature + UUID-Artist pair was detected but not removed.
- metadata._scrub_ai_exif(): deletes the xAI signature pair and any
Software/Make/Artist/ImageDescription tag carrying an AI_GENERATOR_TOKENS
token (so Ideogram's Make="Ideogram AI" is scrubbed too), keeping genuine
camera/editor EXIF intact.
- Shared _is_xai_signature_pair / _exif_text helpers (module-level compiled
regexes) are now the single source of truth, used by both xai_signature
and _scrub_ai_exif.
- Tests: Grok signature stripped on JPEG output, Ideogram Make stripped,
real-camera Make ("Apple") preserved. 325 passing.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>