{"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-theoldmillhouse-ceq40lcz","versions":[{"created_at":"2026-08-20T16:03:19Z","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":"5674edce9831e185d5e8013fe3bfedd4918082c4e88a0d5a22029e1e321c4c4c","version":2},{"created_at":"2026-08-20T16:03:16Z","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}]}