{
  "tool": "Built-in image generation",
  "imageFile": "congress-illustration.png",
  "createdDate": "2026-09-07",
  "referenceRole": "Newly authored GLB three-quarter render used as visual reference",
  "referenceFile": "congress-model-three-quarter.png",
  "historicalStatus": "Supplemental interpretive artwork, not documentary evidence or an exact GLB render",
  "generationPrompt": "Create a highly detailed photorealistic 3D historical visualization of the Great Lakes wooden screw steam freighter Congress, originally named Detroit, early working form around 1861–1865. Use the attached newly authored 3D model as the silhouette and deck arrangement reference. Approximately 139-foot hull with provisional 25-foot beam, long wooden planked dark brown lower hull, muted dark upper strakes and pale trim. Forward compact two-level wheelhouse, low aft cabin with repeated small rectangular windows, ONE tall black funnel at front of aft cabin, TWO slender bare working masts and their simple lifting booms, rigging, anchors, windlass, two covered central cargo hatches, subtle side cargo-port recesses, cabin roof skylight and small ship's boat aft. NO deployed sails, no side paddle wheels, no large hog arches, no guns, no military decoration, no stacks of deck freight. Follow model proportions and avoid inventing later oil-burning equipment. Intact working vessel on calm Lake Huron, soft warm late afternoon light, distant natural forest shoreline, gentle funnel smoke. Entire ship in frame, detailed oblique three-quarter marine visualization, landscape 3:2. No text, labels, people, border, modern structures or other ships. The model is a carefully labeled interpretation, not a verified complete historical portrait.",
  "artefactCheck": {
    "date": "2026-09-08",
    "crops": [
      "bow",
      "midships",
      "stern",
      "rig-superstructure"
    ],
    "nativePixelInspection": true,
    "result": "clean",
    "imageSha256": "a5db9a6e75e7b252cac063da9cb9061ef71819a94ec989d4384d73f25f4bf714",
    "observations": "Four native-pixel crops inspected. No weapons, garbled lettering, material mismatch, added masts, disconnected fittings or modern equipment observed. Interpretive details and background scenery are not documentary evidence."
  },
  "imageSha256": "a5db9a6e75e7b252cac063da9cb9061ef71819a94ec989d4384d73f25f4bf714"
}