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China-served generators embed an XMP <TC260:AIGC>{"Label":"1",...} block
(China's mandatory AI-content labeling, TC260 standard). Doubao (ByteDance)
uses it -- verified on the real #13 sample. It's none of C2PA / SynthID /
imwatermark / IPTC, so identify() previously returned unknown.
- metadata: AIGC_MARKERS + aigc_label() (json-decodes the HTML-entity-encoded
block); has_ai_metadata + get_ai_metadata now surface it.
- identify: new 'aigc' signal -> is_ai True, platform 'China AIGC-labeled
generator (TC260; e.g. Doubao)', carries the ContentProducer code.
- Container-agnostic raw-byte scan, so it covers the whole China-AIGC ecosystem
(Jimeng/Kling/Qwen/Ernie share the standard).
- Tests: synthetic TC260 block (metadata + identify). Docs updated.
Addresses #13.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>