{"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-yvurhbn4","versions":[{"created_at":"2026-06-11T01:56:44Z","element_count":84,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"f2689394829d1a2e147c5dbfddeeb3b9da43cb398db2d951c7f76054f6641a3d","version":6},{"created_at":"2026-06-11T00:21:59Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"63bd3203fe4afa820cf7f8fd9e7625761ee9841ff2d4dd8f3e5257016ea005fb","version":2}]}