{"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-riverstonebungalow-d4acx67q","versions":[{"created_at":"2026-06-13T18:48:47Z","element_count":91,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"9985ec09291cc32551922b2497dac40ab3f3c087dfc65e6cdb9ec5a01102e3f5","version":3},{"created_at":"2026-06-13T18:31:19Z","element_count":107,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"30780dcb179167b08c4b422f76a81fdf2acf73786427d6fd7d660d1f661c9606","version":2},{"created_at":"2026-06-13T18:31:18Z","element_count":107,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}