{"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-2xkv1n14","versions":[{"created_at":"2026-06-13T19:04:03Z","element_count":73,"note":"5軸GA polish 44->97 by M5 (autonomous)","saved_by":"mcp","sha256":"ea4b93aeb5dacb4880b5f1c7d58679e149cc2702ea149966d3333430623c2117","version":3},{"created_at":"2026-06-13T18:51:31Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"1b0bf34fc7df5ed502b3665f68ebb2cc9a1cf84f7810b4212a8041355c39902a","version":2},{"created_at":"2026-06-13T18:51:28Z","element_count":90,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}