{"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-33vclssh","versions":[{"created_at":"2026-08-01T19:48:50Z","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":"c1a5aa47b5e9b6147113662e06d4570821665e7fa5f2e134341cd91dc200b726","version":2},{"created_at":"2026-08-01T19:48:50Z","element_count":107,"note":"言葉から生成: LDK+主寝室+子供室+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}