{"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-uprdni5u","versions":[{"created_at":"2026-06-10T13:12:08Z","element_count":63,"note":"backfill: 延床=居室床スラブ実面積90.0㎡(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":"9a7b71d4e5dc3150e1bc341376232497dbac4421e1d53a6fcd39cc6e279e75cf","version":11},{"created_at":"2026-06-10T08:32:38Z","element_count":72,"note":"5軸GA polish 54->97 by M5 (autonomous)","saved_by":"mcp","sha256":"b7ddcf2774c781384c6d56cac337c2a388d4d297f15d757c1c656156523f4f4b","version":3}]}