{"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-vbnh1ugb","versions":[{"created_at":"2026-07-03T06:39:56Z","element_count":89,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ddaf405a8fbc5c87bf007ce3bc0b56529ab51857a8ccfa0769a471455402f64c","version":3},{"created_at":"2026-07-03T06:30:59Z","element_count":126,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"c26bcc01168f9af1f61406a938ca408ac52dc464df164ca2bcf807e3345f28d6","version":2},{"created_at":"2026-07-03T06:30:59Z","element_count":126,"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}]}