{"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-willowcreekbungalow-7wtyk4y0","versions":[{"created_at":"2026-08-14T23:11:56Z","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":"86e96bb1181c0e6966425c3809f023a244676c4ac3e50d99eaf3fed6c312e784","version":2},{"created_at":"2026-08-14T23:11:56Z","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}]}