{"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-2h8k834k","versions":[{"created_at":"2026-06-11T01:39:03Z","element_count":84,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"e7500529bff45d5860ce7fb7a91afd87f9f19f0c22555881dcadb204e3ca0cf0","version":11},{"created_at":"2026-06-10T23:08:33Z","element_count":44,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"58cbde268ad652827a0c019150e1da96b6d7b0cecaf1dc552dc6fe00852dc0aa","version":2}]}