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  "approved_at": "2026-07-17",
  "source_contract": "user-approved +2s-settled-flow",
  "approval": {
    "status": "user-approved",
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    "tile_box": "400x320",
    "preview_fps": "12/1",
    "palette_colors": 160,
    "frame_delays_centiseconds": {
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}