{"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-6p3ch0hr","versions":[{"created_at":"2026-06-15T19:36:54Z","element_count":83,"note":"5軸GA polish 38->93 by M5 (autonomous)","saved_by":"mcp","sha256":"f5f3a57ae85d52e0e2406a6f33f5235766316cb32b4ef54a3319fc2ef9726a40","version":3},{"created_at":"2026-06-15T19:24:16Z","element_count":119,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"9bcf5a648f1e9c813a330f369e68de992c09414f097fc5182004379eed763b31","version":2},{"created_at":"2026-06-15T19:24:15Z","element_count":119,"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}]}