{"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-c7ahzkw3","versions":[{"created_at":"2026-06-11T03:57:19Z","element_count":83,"note":"5軸GA polish 43->96 by M5 (autonomous)","saved_by":"mcp","sha256":"73a18e42aae548375f31d256fd6c3fb66c83158b527cffb6a1079ffc775ebe8d","version":3},{"created_at":"2026-06-11T03:49:27Z","element_count":84,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0c0aa525e225d62d100c9cef41eb3baa6cb297948732516e52a8d9afd5225dc7","version":2}]}