{"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-hawthornhouse-flbp8px8","versions":[{"created_at":"2026-06-25T13:29:05Z","element_count":83,"note":"5軸GA polish 38->92 by M5 (autonomous)","saved_by":"mcp","sha256":"c6ed1a001a00556806dce931bae70aede4e0bb725fb80958c9f9a60b23bfbf41","version":3},{"created_at":"2026-06-25T13:25:49Z","element_count":101,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"7faeede6602a93aa16365aa593e428815a6ddf4e20278a40188c772015a5754f","version":2},{"created_at":"2026-06-25T13:25:49Z","element_count":101,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}