{"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-3xyye9xv","versions":[{"created_at":"2026-06-11T01:05:15Z","element_count":71,"note":"5軸GA polish 47->95 by M5 (autonomous)","saved_by":"mcp","sha256":"26f42cab285c644481dc797c4f9e22e40a89beca37e31a5a81747210c40163e3","version":12},{"created_at":"2026-06-10T22:34:41Z","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":"123deb3197aec85e3d7a26ecbca4c784c0f3e9d17b55d93d4fe94e4822806f6b","version":2}]}