{"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-willowdalehouse-oaxhi2mb","versions":[{"created_at":"2026-06-27T19:13:18Z","element_count":72,"note":"5軸GA polish 38->89 by M5 (autonomous)","saved_by":"mcp","sha256":"f31f08c750d96c95e157737ca1fa02b3c939033fa6487f7a0b2f76c0e3400614","version":3},{"created_at":"2026-06-27T19:00:38Z","element_count":86,"note":"loop3: 設計時延床 48.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"a60aebac5f413371280a2078cceebcb67b1ce18bf05e9aa23b6cb1f19562297b","version":2},{"created_at":"2026-06-27T19:00:38Z","element_count":86,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}