{"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-3x6ced06","versions":[{"created_at":"2026-06-11T01:39:35Z","element_count":73,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"f3f69b0ca9b3d6940dba35eb7ea6c05a748728243380495392d10e66567a8ed0","version":8},{"created_at":"2026-06-10T23:37:57Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"f39389f646216b6254b34e7ba83e35420e4f71c91702a02ca11fe3cc0830d354","version":2}]}