{"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-ykqpv1e7","versions":[{"created_at":"2026-06-11T00:48:53Z","element_count":71,"note":"5軸GA polish 42->96 by M5 (autonomous)","saved_by":"mcp","sha256":"3dce98a4722af6811af4e6df7c2aa05baca6faaaadde450999a9602547dd7753","version":15},{"created_at":"2026-06-10T22:09:12Z","element_count":47,"note":"loop3: 設計時延床 60.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"285d07bfa02aeab24f066090ba3ae492ec490f0b771c8a792edefbf8302d5e1a","version":2}]}