{"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-d5c9thnr","versions":[{"created_at":"2026-06-11T01:57:00Z","element_count":73,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"a373a4ac36dd1e7b4377e06ae6e52d102228479233432c62f0dfe671ba0c5e1a","version":7},{"created_at":"2026-06-11T00:01:41Z","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":"e7f7a5cdc933356edd9e1caf0eb4afa5926021afdd92d1b489b2371b8b373451","version":2}]}