{"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-mne8abdw","versions":[{"created_at":"2026-06-18T07:28:52Z","element_count":72,"note":"5軸GA polish 45->94 by M5 (autonomous)","saved_by":"mcp","sha256":"29b84ece17351f233eae39a32a5a16f776585583922ca77f77c4229e13cc01f6","version":3},{"created_at":"2026-06-18T07:20:28Z","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":"8144bfa3108422ff5c86b4b697897d8f02dd8a77b9ab9067b9125b4da434782d","version":2},{"created_at":"2026-06-18T07:20:26Z","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}]}