{"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-q8wmu695","versions":[{"created_at":"2026-06-11T00:48:59Z","element_count":90,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"6996132ade814854d2425bb656b8063a5462a20f87f4caf7b816f9f13bbc85dc","version":15},{"created_at":"2026-06-10T22:01:30Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"44ea30cda74015723413129e33daf5973e1bf3ee4b88870e57b03e0c79a10644","version":2}]}