{"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-hawthornhouse-2ryiaiep","versions":[{"created_at":"2026-06-13T17:52:26Z","element_count":89,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"8a425f0e7c696d68aa6ff79cb213049253e978af2ad19bbfb4e59816a144beb2","version":3},{"created_at":"2026-06-13T17:35:39Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"7e19dba936f565906bf62aa977713869eefc5cb98e5f7d218af6e700a1799dc2","version":2},{"created_at":"2026-06-13T17:35:37Z","element_count":107,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}