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    "sourceWorktree": "/home/louistrue/wt/6232-stair-dimensions-main-session6503",
    "runtimeSha256": "5fbc315fb686b9a89f49c5c118d3cdec9646763109b14f73b3b078050b8aec13",
    "runtimeBytes": 9377364,
    "servedRuntimeHashVerified": true,
    "input": {
      "path": "apps/viewer/public/samples/hello-wall.ifc",
      "authoringTool": "Bonsai",
      "sha256": "0ab20f4ea355ea9aa4fade7264b97ee9f9929addfa3961b2437c4381bd674014",
      "bytes": 79592,
      "load": "File input change with fetched unmodified sample bytes, canonical viewer load path"
    },
    "flightAuthorship": "Created through the actual Stair tool with native viewport clicks in the loaded public model; the flight was not supplied by Bonsai.",
    "inspectorActions": "Native T3 type then Enter for each of four fields, four native Undo button clicks, then four native Redo button clicks."
  },
  "snapshotSemantics": {
    "cornersHash": "SHA-256 of JSON-serialized world-placed triangle corner positions from the real scene owner; viewer Y-up coordinates.",
    "flatMetadataHash": "SHA-256 of resident part metadata: geometry item IDs, triangles, vertices, textured flag, color and source triangle ordinals.",
    "fullSceneOwnerHash": "SHA-256 of the serialized scene owner: part metadata, instance flag, placed triangle positions and projected screen centre.",
    "otherOwnersHash": "SHA-256 of the complete serialized scene owners for unchanged source wall1222 and windows1262/1407.",
    "undoRecordCount": "Internal history records, not user action count. Each inspector action contains 50 records in one Undo batch; the pre-edit Stair creation contributes58.",
    "gpuBytes": "GPU upload bytes, normals and full vertex/index buffers are not captured by these browser hooks."
  },
  "screenshots": {
    "initial": "initial.png",
    "edited": "edited.png",
    "undoRestored": "undo-restored.png",
    "redoRestored": "redo-restored.png"
  },
  "limitation": "A prior Start blank attempt exposed the existing missing engine-coordinate-frame refusal. No coordinate frame was patched. That attempt is excluded from physical proof and tracked under #6232."
}