{"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-theoldmillhouse-xve1rcg1","versions":[{"created_at":"2026-06-29T15:40:17Z","element_count":83,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"d5b05b7cb02f2d472d77cb09d2d5666493b3c8e6fa71fe24130744ef76bacbc0","version":3},{"created_at":"2026-06-29T15:30:30Z","element_count":130,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"84879ee78b0ce72b01d62ecc0d0464428dd3ed6a8b675864b9ecb28a6a3e83be","version":2},{"created_at":"2026-06-29T15:30:30Z","element_count":130,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}