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Replaces the claim-generator-string match with a distinctive device-token scan of the manifest bytes (_device_platform / _DEVICE_C2PA_PLATFORM), which is more robust: it catches devices where the generator name lives under a non-standard CBOR key (Pixel uses `claim_generator_info`, so it has no `claim_generator`). - Adds Google Pixel, verified against a real Pixel 10 Pro C2PA file (attached to c2pa-rs issue #1609/#1554): cert CN "Pixel Camera", digitalSourceType `computationalCapture` -> capture authenticity, not AI (is_ai stays None). - Token distinctiveness is load-bearing: bare "Truepic" matched the OpenAI chatgpt-1.png fixture (Truepic is a trust-chain signing authority), so the token is the specific "Truepic_Lens"; "Pixel Camera" (cert CN) not "Pixel". - Verified Leica/Nikon/Truepic/Pixel attribute correctly and OpenAI/Adobe/MJ do not regress. Sony/Canon/Samsung/Bria stay unmapped: no public direct- download C2PA sample exists to verify their in-manifest string. - Regression tests: device token beats incidental issuer mentions (Leica, Pixel-vs-Google). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>