{"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-g136iqnp","versions":[{"created_at":"2026-06-10T13:32:50Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積92.5㎡(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":"1d9a1be1afd03a1ad33c31335d8f50d77b168e3c5b367108f4496629318d7fe1","version":7},{"created_at":"2026-06-10T12:16:03Z","element_count":72,"note":"5軸GA polish 61->96 by M5 (autonomous)","saved_by":"mcp","sha256":"adb24060bacca75b7b228d8babe750741aa970f4954dadb4891267f87eb7aa7d","version":3}]}