{"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-theblackthornhouse-9bt8m1t4","versions":[{"created_at":"2026-06-13T17:52:33Z","element_count":83,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"48e4fd22300f2b12ce39635bdef7357593f566b3e15b6863a1ec99fc601f79a8","version":3},{"created_at":"2026-06-13T17:36:13Z","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":"62a75d4bf61103143f3ff05ae176945527880ba0f5b0100e33053a6935dcd375","version":2},{"created_at":"2026-06-13T17:36:13Z","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}]}