{"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-3w31rt5c","versions":[{"created_at":"2026-06-11T01:22:28Z","element_count":84,"note":"5軸GA polish 41->97 by M5 (autonomous)","saved_by":"mcp","sha256":"1b647337a1287f4cd83f41905ea24159a3fea5699f5234961cded55f97368b1f","version":11},{"created_at":"2026-06-10T22:58:07Z","element_count":50,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"34f08ef8de3172d7d0b477afb044ee4f95e941b8924facc6f578c9351242ba4f","version":2}]}