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Broadens metadata provenance coverage at the detection and container-strip level. Detection: - C2PA soft-binding `alg` -> forensic-watermark vendor (Adobe TrustMark, Digimarc, Imatag, Steg.AI, Microsoft, ...) via C2PA_SOFT_BINDINGS + soft_binding_vendors_in(); names the watermark vendor even when the watermark itself can't be decoded. - IPTC Photo Metadata 2025.1 AI-disclosure XMP fields (AISystemUsed etc.) via iptc_ai_system() + IPTC_AI_FIELD_MARKERS. - Adobe TrustMark open keyless decoder (trustmark_detector.py, optional extra `trustmark`) -- the watermark behind Adobe Durable Content Credentials. Detects provenance, not AI origin, so it does not assert is_ai. Removal / containers: - isobmff.strip_c2pa_boxes now also drops a top-level XMP uuid box that carries an AI label (matched by AI-marker content, byte-order-robust; plain XMP kept). - remove_ai_metadata routes MP4/MOV/M4V/M4A (and any ftyp-sniffed ISOBMFF) through the box stripper; raises a clear error for non-ISOBMFF audio/video (WebM/MP3/WAV) instead of crashing in the image path. Tests: soft-binding scan, IPTC element/attribute/presence, MP4 + M4A detect/ strip, ISOBMFF XMP surgical strip, content-sniff, unsupported-container guard, TrustMark absent-safety + identify integration. ruff clean; pyright clean on all new modules. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>