# ENGINEERING_SPEC — ECR-013 Scale bank explore

**ECR:** ECR-013  
**BD:** BD-2026-013  

## Layers

Handler → Service →（scalebank embed \| ScaleRepo）

## Constraints

- Function ≤50 · File ≤400（页面/composable 已接近上限，禁止再堆逻辑）  
- 题目仅 embed；DB 仅 stub scale + results  
- Lexicon：非诊断 disclaimer  

## Frontend

- `ExplorePage` / `ExploreBankCategoryPage` 共用图标 allowlist helper  
- `useScalePage`：slug 响应式；有结果直接 `phase=result`  
- `AppHeader`：`/explore` 显示 BackButton