{"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-80wqpvl9","versions":[{"created_at":"2026-06-30T20:03:08Z","element_count":72,"note":"5軸GA polish 42->92 by M5 (autonomous)","saved_by":"mcp","sha256":"d20583bd407605dfad8211b849d9b4d298e5423753ae4234815fee953af729e9","version":3},{"created_at":"2026-06-30T19:52:21Z","element_count":83,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"420865cdaf4721d73be542477eddb5b9a53a1fc093573362db3a2f1796045d83","version":2},{"created_at":"2026-06-30T19:52:21Z","element_count":83,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}