{"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-willowcreekbungalow-yxz177yb","versions":[{"created_at":"2026-06-30T16:14:20Z","element_count":89,"note":"5軸GA polish 38->92 by M5 (autonomous)","saved_by":"mcp","sha256":"6d8b28cdb0d021dfab51754400e009b4149007daab96389064efeb00c2e108b6","version":3},{"created_at":"2026-06-30T16:11:17Z","element_count":86,"note":"loop3: 設計時延床 55.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"02d9a1f85d137723e9d540cab3df72b298957a14cf50463c8fd118e32ca2b024","version":2},{"created_at":"2026-06-30T16:11:17Z","element_count":86,"note":"言葉から生成: LDK+main bedroom+2 kids rooms+bathroom+storage","saved_by":"mcp:create","sha256":"","version":1}]}