{
  "tool": "Built-in image generation",
  "imageFile": "shamrock-illustration.png",
  "createdDate": "2026-09-07",
  "referenceRole": "Newly authored GLB three-quarter render used as visual reference",
  "referenceFile": "shamrock-model-three-quarter.png",
  "historicalStatus": "Supplemental interpretive artwork, not documentary evidence or an exact GLB render",
  "generationPrompt": "Create one highly detailed realistic 3D historical reconstruction illustration, wide landscape format. Use the attached newly authored 3D model render as the controlling reference for hull proportions, configuration, mast/funnel count, cabin placement and rig; preserve its overall silhouette. Shamrock, 146 by 30 foot wooden Great Lakes carrier. Qualified later STEAM conversion before 1905: one forward cargo mast, small forward wheelhouse, open central lumber deck with stacks, aft cabin and single black funnel. No deployed sails. Hull and deckhouse details are comparative interpretations. Show the complete vessel from the same elevated three-quarter bow angle, isolated on a warm ivory studio background with subtle grounded shadow, refined physically based lighting, realistic restrained timber/metal/rope textures and finely resolved fittings. Clean museum reconstruction presentation, no dramatic scene, no text, watermark, flag markings or people. Do not invent additional major equipment or ornament. This is interpretive artwork, not an archival photograph. Keep the reference configuration while improving material richness and visual realism.",
  "artefactCheck": {
    "date": "2026-09-08",
    "crops": [
      "bow",
      "midships",
      "stern",
      "rig-superstructure"
    ],
    "nativePixelInspection": true,
    "result": "clean",
    "imageSha256": "3aa174efc0a23ee95ade89c82d2ba752da3318ec834bfeca5ebee5aa023b8f5d",
    "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": "3aa174efc0a23ee95ade89c82d2ba752da3318ec834bfeca5ebee5aa023b8f5d"
}