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SD-1.5 dreamshaper at 768 px did not defeat SynthID v2 on Gemini 3 Pro outputs (verified May 2026 via Gemini app's "Verify with SynthID"). Switch the default invisible engine to SDXL at 1024 px, matching the raiw-app production config (strength 0.05, steps 50). Drop the SD-1.5 pipeline. Metadata layer: add C2PA UUID and IPTC AI marker byte-scan detection across all formats, plus an ISOBMFF box walker (noai/isobmff.py) that strips top-level C2PA uuid and JUMBF jumb boxes from AVIF/HEIF/JPEG-XL containers without re-encoding. README gets a Legal table and a Threat-model section about SynthID v2's 136-bit payload. CLAUDE.md tracks the SD-1.5 regression as historical context. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>