{"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-ps2e9l5s","versions":[{"created_at":"2026-06-11T00:49:01Z","element_count":85,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"da861aa43e6f01f1f25eb91c1e35d02b3c467345b2f8d33ce5be46c9d5622f53","version":15},{"created_at":"2026-06-10T22:03:26Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"b83024a5a40fa50885aab940c475a25067a3ffcaab3fb7d48b5ad50aad8a8e42","version":2}]}