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  "anchor": "crease at world (0,0), screen (480,320)",
  "observed_boundary": "archive physical scale unknown; no pixel-to-metre calibration inferred",
  "fixed_fields": [
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  "uncertainty": "constructed coordinates exact by definition, not estimates of historical geometry; archival physical dimensions unknown",
  "resolution": "vector model rendered at output resolution; archive uniformly upscaled from native raster, no claim of recovered detail"
}