{"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-xwsc3uy9","versions":[{"created_at":"2026-06-11T01:05:14Z","element_count":72,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ba4448b3eb938079b699089d273d55fb7ffdee1378d6d8aa91d7b1bcb7ae8d2a","version":14},{"created_at":"2026-06-10T22:17:16Z","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":"9f179856646434358d7d1cadfd1a4e6b3525b8c75a4150eb29095fa7f9eaee72","version":2}]}