{"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-7977h2jw","versions":[{"created_at":"2026-06-22T06:30:19Z","element_count":73,"note":"5軸GA polish 45->94 by M5 (autonomous)","saved_by":"mcp","sha256":"a7c8751a40eaaedee38098260bbdd3c2d7ad6134c0199dff6279e5051067a429","version":3},{"created_at":"2026-06-22T06:18:50Z","element_count":105,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"787474ea1f28ae89d090df226efefddcaaff6eaca99cce38949ec5b39811b3ac","version":2},{"created_at":"2026-06-22T06:18:46Z","element_count":105,"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}]}