{"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-ptz8o744","versions":[{"created_at":"2026-06-29T19:50:45Z","element_count":83,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"1a31b4220daac4b7051d942839ac578b79bf3221973d8305e6b4024042e6b7a9","version":3},{"created_at":"2026-06-29T19:42:10Z","element_count":88,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"166bb2779762478fb586d01bf6ef0b0604f18e190d8b37f7460823e2349b8e1a","version":2},{"created_at":"2026-06-29T19:42:10Z","element_count":88,"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}]}