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  "actualTestDate": "2026-11-08 Asia/Tokyo",
  "taskAttribution": "2026-11-07 delayed completion",
  "method": "Inputs explicitly decoded using verified limited-range matrix; saved output decoded according to stored tags toRGB. Compare9x9 patches at same burned-in source counter, outside repair. Each pixel component diff=output-input; MAE=mean(abs(diff)) across9*9*3; max absolute component difference. Not calibrated perceptual color or isolated pipeline cause.",
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  "firstAttempt": "709 first export returned Export was empty. No result. Same input retry yielded actual download; failure retained in browser-709-first-failure.txt",
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