{"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-9wm8lrvy","versions":[{"created_at":"2026-06-13T20:29:09Z","element_count":89,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"8a425f0e7c696d68aa6ff79cb213049253e978af2ad19bbfb4e59816a144beb2","version":3},{"created_at":"2026-06-13T20:11:02Z","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":"93248bcd056168870dfeda1b53f6e63ef84bee5cf8bf2f76127704332996d23c","version":2},{"created_at":"2026-06-13T20:11:01Z","element_count":107,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}