{"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-willowcreekbungalow-n92kujgi","versions":[{"created_at":"2026-07-18T00:30:19Z","element_count":89,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"40a9c7fc901797effa742d92973dd7fb1932a4eb5d2d2f027d564aa4b3e28131","version":3},{"created_at":"2026-07-18T00:09:06Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"f284105062d64c9f7d542c4b99ac1608f48d650eb3be225d954dab73d6fe44a3","version":2},{"created_at":"2026-07-18T00:09:06Z","element_count":107,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}