{"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-house-p6ttbzvn","versions":[{"created_at":"2026-06-10T13:25:34Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積93.9㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"c49e156e5c8da6407d7eff35ef949beb4b069ba57b9e850ed773295d3c7a75b6","version":11},{"created_at":"2026-06-10T11:10:05Z","element_count":73,"note":"5軸GA polish 61->97 by M5 (autonomous)","saved_by":"mcp","sha256":"29318b5b0c359eebc570d36218ac4daa76a6cfcdfe45abab46565d0e64daddf5","version":4}]}