{"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-z4e55hmr","versions":[{"created_at":"2026-08-04T06:33:56Z","element_count":119,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"c39faf80884b82ab301cd8a02139641b89d20f2783864677fe92ee3a2f32c77b","version":2},{"created_at":"2026-08-04T06:33:56Z","element_count":119,"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}]}