{"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-rip7qt8u","versions":[{"created_at":"2026-06-10T13:25:46Z","element_count":77,"note":"backfill: 延床=居室床スラブ実面積74.1㎡(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":"d644fde2885decc44afb827cdaebdf59663253f1c60374de245be308adde0d1f","version":10},{"created_at":"2026-06-10T11:26:47Z","element_count":85,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ab3bd7b10ec51ae54147bca7306b4bafb779b7a68e734a8fa8108e95b8755936","version":4}]}