{"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-oa8mf1n7","versions":[{"created_at":"2026-06-11T03:43:57Z","element_count":72,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"d76c6c4e215ae4fd32eaa4ac8dd4e0c63a2fb66e2032f4f037b12069dc085d80","version":3},{"created_at":"2026-06-11T03:34:09Z","element_count":89,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e481f1c1a3cf0dd6fc824e8b3d5df6c5e423dd37192d1a3b5c5440e270e89b05","version":2}]}