{
  "release": "tt-motor-classroom-1.0-run027",
  "baseline": "run_026",
  "source_snapshot": "run_027",
  "source_sha256": "deca4bec8aa6c385a9214dbe3390b768b1cbcb9fc3e74dff55429f1c841ff895",
  "identity_scope": "该 FBX 工作快照；不保证任意重新导出后仍保持相同 ID。",
  "geometry": "真实 FBX 逐姿态投影；217 帧教学分离与既有同步转动姿态复用，未修改几何。",
  "cover_selection": {
    "revision": "run_027",
    "source_id": "fbx-1524956416",
    "policy": "仅调整真实顶盖源对象的选中样式；按原 SVG 明暗档保留已有特征，不新增线、面或机械语义。",
    "base": "#386f5b",
    "outline": "#214e3d",
    "outline_width": 2.2,
    "shade_palette": {
      "#c79c00": "#386f5b",
      "#f0bc00": "#75b99b",
      "#ffd800": "#b8e2cc"
    },
    "fill_opacity": 1
  },
  "teaching_boundary": "教学分离观察，不代表真实拆装顺序或已确认的固连、啮合关系。",
  "unconfirmed": [
    "接线",
    "磁极",
    "电刷接触",
    "换向分段",
    "运动分组",
    "齿数与传动比",
    "啮合与固连"
  ]
}