{"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-90mzvml3","versions":[{"created_at":"2026-06-11T01:38:53Z","element_count":89,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"6fb014418898d846304abc4c344d7e5f6d7ee1d44e524384944de8bcfdd7c316","version":8},{"created_at":"2026-06-10T23:41:54Z","element_count":46,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"5829aa3b1483cb3b077b7485388eb55cc814848f119fffd6bba35fb0b633626f","version":2}]}