{"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-nczxqny8","versions":[{"created_at":"2026-06-11T00:48:49Z","element_count":72,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"96cd003edb132b9fbd6204ca68d3276f5e1ebfd7db8a5ac74b3e609b9619102e","version":15},{"created_at":"2026-06-10T22:02:55Z","element_count":47,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"88edff231e8f456d4b5b58a88bd56fb81f593f023e0c485c4c926a6a9968a158","version":2}]}