{"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-6fhanny4","versions":[{"created_at":"2026-06-11T01:38:59Z","element_count":85,"note":"5軸GA polish 41->96 by M5 (autonomous)","saved_by":"mcp","sha256":"10cabba98ce79ac63f210a371728f7a41ba8e15e474c1da7f61e113e48d0e676","version":9},{"created_at":"2026-06-10T23:34:04Z","element_count":50,"note":"loop3: 設計時延床 40.5㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"f4b55cbc511b99d420656449f0556ffd8ef43f0144de5baa7db89b2d03b72bb3","version":2}]}