{"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-ynf8d970","versions":[{"created_at":"2026-06-11T00:48:41Z","element_count":73,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"5325d3b3a91c5f8af812e9bd52b3b6fd2e4471a45f0305955f4e9ac242af6685","version":15},{"created_at":"2026-06-10T22:08:27Z","element_count":46,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"41ce7131d534c50ede587755038120e984ca078f644ac6d75bcd4e79b55b7436","version":2}]}