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feat(identify): attribute Canva (Magic Media) and BytePlus (ByteDance international: Seedream/Seededit) C2PA, and fix a BytePlus->Adobe-Firefly mis-attribution (an incidental "Adobe XMP" file string the fallback byte-scan picked up). Found via mining real production traffic; 16 corpus attributions improved, 0 regressions.
perf(text-mark): footprint-sized arrays in the reverse-alpha CPU path.
test: add real Black Forest Labs FLUX.2 C2PA fixtures (flux-1.png + flux-1.jpg, the first committed JPEG-with-C2PA fixture exercising the c2pa-python non-PNG reader path).
docs: characterize the open imwatermark DWT-DCT detector as a positive-only signal (carrier-fragile: a None is inconclusive unless a same-carrier positive control recovers >=44/48); FLUX is reliably identified by C2PA.