{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-willowbrookbungalow-r4xi34fp","versions":[{"created_at":"2026-06-23T11:03:30Z","element_count":91,"note":"5軸GA polish 46->98 by M5 (autonomous)","saved_by":"mcp","sha256":"cc2cbb5613e6b114e3967445bf01acf98fd6b6353b1501918d0503cfb28329a5","version":3},{"created_at":"2026-06-23T10:51:47Z","element_count":87,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"d3407f943763280c351067d95fa4637ddcefc95dcb35aa2caa02451ff70826f4","version":2},{"created_at":"2026-06-23T10:51:45Z","element_count":87,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}